{"id":2085,"date":"2023-04-01T21:53:57","date_gmt":"2023-04-01T13:53:57","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=2085"},"modified":"2023-04-06T15:48:33","modified_gmt":"2023-04-06T07:48:33","slug":"join-patient-summary","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/04\/01\/join-patient-summary\/","title":{"rendered":"\u5173\u4e8e JOIN \u8010\u5fc3\u603b\u7ed3\uff0c\u5b66\u4e0d\u4f1a\u4f60\u6253\u6211\u7cfb\u5217"},"content":{"rendered":"

\u73b0\u5728\u968f\u7740\u5404\u79cd\u6570\u636e\u5e93\u6846\u67b6\u7684\u76db\u884c\uff0c\u5728\u63d0\u9ad8\u6548\u7387\u7684\u540c\u65f6\u4e5f\u8ba9\u6211\u4eec\u5ffd\u7565\u4e86\u5f88\u591a\u5e95\u5c42\u7684\u8fde\u63a5\u8fc7\u7a0b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u662f\u5bf9 SQL \u8fde\u63a5\u8fc7\u7a0b\u68b3\u7406\uff0c\u5e76\u6d89\u53ca\u5230\u4e86\u73b0\u5728\u5e38\u7528\u7684 SQL \u6807\u51c6\u3002<\/p>\n

\u5176\u5b9e\u6807\u51c6\u5c31\u662f\u5728\u4e0d\u540c\u7684\u65f6\u95f4\uff0c\u5236\u5b9a\u7684\u4e00\u4e9b\u5199\u6cd5\u6216\u89c4\u8303\u3002<\/p>\n

\u4ece SQL \u6807\u51c6\u8bf4\u8d77<\/h2>\n

\u5728\u7f16\u5199 SQL \u8bed\u53e5\u524d\uff0c\u9700\u8981\u5148\u4e86\u89e3\u5728\u4e0d\u540c\u7248\u672c\u7684\u89c4\u8303\uff0c\u56e0\u4e3a\u968f\u7740\u7248\u672c\u7684\u53d8\u5316\uff0c\u5728\u5177\u4f53\u7f16\u5199 SQL \u65f6\u4f1a\u6709\u6240\u4e0d\u540c\u3002\u5bf9\u4e8e SQL \u6765\u8bf4\uff0cSQL92 \u548c SQL99 \u662f\u6700\u5e38\u89c1\u7684\u4e24\u4e2a SQL \u6807\u51c6\uff0c92 \u548c 99 \u5bf9\u5e94\u5176\u63d0\u51fa\u7684\u5e74\u4efd\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u5b58\u5728 SQL86\u3001SQL89\u3001SQL2003\u3001SQL2008\u3001SQL2011\uff0cSQL2016\u7b49\u7b49\u3002<\/p>\n

<\/p>\n

\u4f46\u5bf9\u6211\u4eec\u6765\u8bf4\uff0cSQL92 \u548c SQL99 \u662f\u6700\u5e38\u7528\u7684\u4e24\u4e2a\u6807\u51c6\uff0c\u4e3b\u8981\u5b66\u4e60\u8fd9\u4e24\u4e2a\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n

\u4e3a\u4e86\u6f14\u793a\u65b9\u4fbf\uff0c\u73b0\u5728\u6570\u636e\u5e93\u4e2d\u52a0\u5165\u5982\u4e0b\u4e09\u5f20\u8868\uff1a<\/p>\n

\u6bcf\u4e2a\u5b66\u751f\u5c5e\u4e8e\u4e00\u4e2a\u73ed\u7ea7\uff0c\u901a\u8fc7\u73ed\u7ea7\u7684\u4eba\u6570\u6765\u5bf9\u5e94\u73ed\u7ea7\u7684\u7c7b\u578b\u3002<\/p>\n

-- ----------------------------\nDROP TABLE IF EXISTS `Student`;\nCREATE TABLE `Student` (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `name` varchar(20) NOT NULL DEFAULT '',\n  `birth` varchar(20) NOT NULL DEFAULT '',\n  `sex` varchar(10) NOT NULL DEFAULT '',\n  `class_id` int(11) NOT NULL COMMENT '\u73ed\u7ea7ID',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;\n\n-- ----------------------------\n-- Records of Student\n-- ----------------------------\nINSERT INTO `Student` VALUES ('1', '\u80e1\u4e00', '1994.1.1', '\u7537', '1');\nINSERT INTO `Student` VALUES ('3', '\u738b\u963f', '1992.1.1', '\u5973', '1');\nINSERT INTO `Student` VALUES ('5', '\u738b\u7426', '1993.1.2', '\u7537', '1');\nINSERT INTO `Student` VALUES ('7', '\u5218\u4f1f', '1998.2.2', '\u5973', '1');\nINSERT INTO `Student` VALUES ('11', '\u5f20\u4f7f', '1994.1.1', '\u7537', '3');\nINSERT INTO `Student` VALUES ('13', '\u738b\u963f', '1992.1.1', '\u5973', '3');\nINSERT INTO `Student` VALUES ('15', '\u590f\u742a', '1993.1.2', '\u7537', '3');\nINSERT INTO `Student` VALUES ('17', '\u5218\u8868', '1998.2.2', '\u5973', '3');\nINSERT INTO `Student` VALUES ('19', '\u8bf8\u845b', '1994.1.1', '\u7537', '3');\nINSERT INTO `Student` VALUES ('21', '\u738b\u524d', '1992.1.1', '\u5973', '3');\nINSERT INTO `Student` VALUES ('23', '\u738b\u610f\u8bc6', '1993.1.2', '\u7537', '3');\nINSERT INTO `Student` VALUES ('25', '\u5218\u7b49\u5f85', '1998.2.2', '\u5973', '3');\nINSERT INTO `Student` VALUES ('27', '\u80e1\u662f\u4e00', '1994.1.1', '\u7537', '5');\nINSERT INTO `Student` VALUES ('29', '\u738b\u963f\u8bf7', '1992.1.1', '\u5973', '5');\nINSERT INTO `Student` VALUES ('31', '\u738b\u6d88\u606f', '1993.1.2', '\u7537', '5');\nINSERT INTO `Student` VALUES ('33', '\u5218\u5168', '1998.2.2', '\u5973', '5');\nINSERT INTO `Student` VALUES ('35', '\u80e1\u7231', '1994.1.1', '\u7537', '5');\nINSERT INTO `Student` VALUES ('37', '\u738b\u8868', '1992.1.1', '\u5973', '5');\nINSERT INTO `Student` VALUES ('39', '\u738b\u534e', '1993.1.2', '\u7537', '5');\nINSERT INTO `Student` VALUES ('41', '\u5218\u4f1f\u4ee5', '1998.2.2', '\u5973', '5');\nINSERT INTO `Student` VALUES ('43', '\u80e1\u4e00\u5f6a', '1994.1.1', '\u7537', '5');\nINSERT INTO `Student` VALUES ('45', '\u738b\u963f\u7b26', '1992.1.1', '\u5973', '5');\nINSERT INTO `Student` VALUES ('47', '\u738b\u7426\u5220', '1993.1.2', '\u7537', '5');\nINSERT INTO `Student` VALUES ('49', '\u5218\u8fbe\u8fbe', '1998.2.2', '\u5973', '5');\n\n-- ----------------------------\n-- Table structure for `Class`\n-- ----------------------------\nDROP TABLE IF EXISTS `Class`;\nCREATE TABLE `Class` (\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `name` varchar(20) NOT NULL DEFAULT '',\n  `number` int(11) NOT NULL DEFAULT 0,\n  `class_type_id` int(11) NOT NULL COMMENT '\u73ed\u7ea7\u7c7b\u578bID',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;\n\n-- ----------------------------\n-- Records of Class\n-- ----------------------------\nINSERT INTO `Class` VALUES ('1', '1\u5e741\u73ed', 4, '1');\nINSERT INTO `Class` VALUES ('3', '1\u5e742\u73ed', 8, '3');\nINSERT INTO `Class` VALUES ('5', '1\u5e743\u73ed', 12, '5');\n\nDROP TABLE IF EXISTS `ClassType`;\nCREATE TABLE `ClassType`(\n  `id` int(11) NOT NULL AUTO_INCREMENT,\n  `name` VARCHAR(20) NOT NULL DEFAULT '',\n  `minimum_number` int(11) NOT NULL DEFAULT 0 COMMENT '\u6700\u5c11\u7684\u73ed\u7ea7\u4eba\u6570',\n  `maximum_number` int(11) NOT NULL DEFAULT 0 COMMENT '\u6700\u591a\u7684\u73ed\u7ea7\u4eba\u6570',\n  PRIMARY KEY(`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\nINSERT INTO `ClassType` VALUES ('1', '\u5c0f\u73ed', '1', '4');\nINSERT INTO `ClassType` VALUES ('3', '\u4e2d\u73ed', '5', '8');\nINSERT INTO `ClassType` VALUES ('5', '\u5927\u73ed', '9', '12');<\/code><\/pre>\n
SQL92<\/h2>\n
\u7b1b\u5361\u5c14\u79ef\uff08\u4ea4\u53c9\u8fde\u63a5\uff09<\/h3>\n
\u7b1b\u5361\u5c14\u79ef\u662f\u4e00\u4e2a\u6570\u5b66\u4e0a\u7684\u6982\u5ff5\uff0c\u8868\u793a\u5982\u679c\u5b58\u5728 X\uff0cY \u4e24\u4e2a\u96c6\u5408\uff0c\u5219 X\uff0cY \u7684\u7b1b\u5361\u5c14\u79ef\u8bb0\u4e3a X * Y. \u8868\u793a\u7531 X\uff0cY \u7ec4\u6210\u6709\u5e8f\u5bf9\u7684\u6240\u6709\u60c5\u51b5\u3002<\/p>\n
\u5bf9\u5e94\u5728 SQL \u4e2d\uff0c\u5c31\u662f\u5c06\u4e24\u5f20\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u8fdb\u884c\u7ec4\u5408\u3002\u800c\u4e14\u5728\u8fde\u63a5\u65f6\uff0c\u53ef\u4ee5\u6ca1\u6709\u4efb\u4f55\u9650\u5236\uff0c\u53ef\u5c06\u6ca1\u6709\u5173\u8054\u5173\u7cfb\u7684\u4efb\u610f\u8868\u8fdb\u884c\u8fde\u63a5\u3002<\/p>\n
\u8fd9\u91cc\u62ff\u5b66\u751f\u8868\u548c\u73ed\u7ea7\u8868\u4e3e\u4f8b\uff0c\u5728\u5b66\u751f\u8868\u4e2d\u6211\u4eec\u63d2\u5165\u4e8620\u540d\u5b66\u751f\u7684\u6570\u636e\uff0c\u8bfe\u7a0b\u8868\u4e2d\u63d2\u5165\u4e09\u4e2a\u73ed\u7ea7\u3002\u5219\u5b66\u751f\u548c\u73ed\u7ea7\u7684\u7b1b\u5361\u5c14\u7ed3\u679c\u5c31\u662f\u5c06\u4e24\u8868\u7684\u6bcf\u884c\u6570\u636e\u4e00\u4e00\u7ec4\u5408\uff0c\u6700\u540e\u5c31\u662f\u6709 24 * 3 = 72 \u884c\u7684\u7ed3\u679c\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n
\u5e76\u4e14\u9700\u8981\u77e5\u9053\u7684\u662f\uff0c\u4e0b\u9762\u5b66\u4e60\u7684\u5916\u8fde\u63a5\uff0c\u81ea\u8fde\u63a5\uff0c\u7b49\u503c\u8fde\u63a5\u7b49\u90fd\u662f\u5728\u7b1b\u5361\u5c14\u79ef\u7684\u57fa\u7840\u4e0a\u7b5b\u9009\u5f97\u5230\u7684\u3002<\/p>\n
\u5bf9\u5e94\u7684 SQL92 \u5199\u6cd5\u4e3a\uff1a<\/p>\n
select * from Student, Class;<\/code><\/pre>\n
mysql> select * from Student, Class;\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n| id | name      | birth    | sex | class_id | id | name     | number | class_type_id |\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n|  1 | \u80e1\u4e00      | 1994.1.1 | \u7537  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  1 | \u80e1\u4e00      | 1994.1.1 | \u7537  |        1 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  1 | \u80e1\u4e00      | 1994.1.1 | \u7537  |        1 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n|  3 | \u738b\u963f      | 1992.1.1 | \u5973  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  3 | \u738b\u963f      | 1992.1.1 | \u5973  |        1 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  3 | \u738b\u963f      | 1992.1.1 | \u5973  |        1 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n|  5 | \u738b\u7426      | 1993.1.2 | \u7537  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  5 | \u738b\u7426      | 1993.1.2 | \u7537  |        1 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  5 | \u738b\u7426      | 1993.1.2 | \u7537  |        1 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n|  7 | \u5218\u4f1f      | 1998.2.2 | \u5973  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  7 | \u5218\u4f1f      | 1998.2.2 | \u5973  |        1 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  7 | \u5218\u4f1f      | 1998.2.2 | \u5973  |        1 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 11 | \u5f20\u4f7f      | 1994.1.1 | \u7537  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 11 | \u5f20\u4f7f      | 1994.1.1 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 11 | \u5f20\u4f7f      | 1994.1.1 | \u7537  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 13 | \u738b\u963f      | 1992.1.1 | \u5973  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 13 | \u738b\u963f      | 1992.1.1 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 13 | \u738b\u963f      | 1992.1.1 | \u5973  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 15 | \u590f\u742a      | 1993.1.2 | \u7537  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 15 | \u590f\u742a      | 1993.1.2 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 15 | \u590f\u742a      | 1993.1.2 | \u7537  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 17 | \u5218\u8868      | 1998.2.2 | \u5973  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 17 | \u5218\u8868      | 1998.2.2 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 17 | \u5218\u8868      | 1998.2.2 | \u5973  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 19 | \u8bf8\u845b      | 1994.1.1 | \u7537  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 19 | \u8bf8\u845b      | 1994.1.1 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 19 | \u8bf8\u845b      | 1994.1.1 | \u7537  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 21 | \u738b\u524d      | 1992.1.1 | \u5973  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 21 | \u738b\u524d      | 1992.1.1 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 21 | \u738b\u524d      | 1992.1.1 | \u5973  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 23 | \u738b\u610f\u8bc6    | 1993.1.2 | \u7537  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 23 | \u738b\u610f\u8bc6    | 1993.1.2 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 23 | \u738b\u610f\u8bc6    | 1993.1.2 | \u7537  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 25 | \u5218\u7b49\u5f85    | 1998.2.2 | \u5973  |        3 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 25 | \u5218\u7b49\u5f85    | 1998.2.2 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 25 | \u5218\u7b49\u5f85    | 1998.2.2 | \u5973  |        3 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 27 | \u80e1\u662f\u4e00    | 1994.1.1 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 27 | \u80e1\u662f\u4e00    | 1994.1.1 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 27 | \u80e1\u662f\u4e00    | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 29 | \u738b\u963f\u8bf7    | 1992.1.1 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 29 | \u738b\u963f\u8bf7    | 1992.1.1 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 29 | \u738b\u963f\u8bf7    | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 31 | \u738b\u6d88\u606f    | 1993.1.2 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 31 | \u738b\u6d88\u606f    | 1993.1.2 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 31 | \u738b\u6d88\u606f    | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 33 | \u5218\u5168      | 1998.2.2 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 33 | \u5218\u5168      | 1998.2.2 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 33 | \u5218\u5168      | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 35 | \u80e1\u7231      | 1994.1.1 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 35 | \u80e1\u7231      | 1994.1.1 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 35 | \u80e1\u7231      | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 37 | \u738b\u8868      | 1992.1.1 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 37 | \u738b\u8868      | 1992.1.1 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 37 | \u738b\u8868      | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 39 | \u738b\u534e      | 1993.1.2 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 39 | \u738b\u534e      | 1993.1.2 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 39 | \u738b\u534e      | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 41 | \u5218\u4f1f\u4ee5    | 1998.2.2 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 41 | \u5218\u4f1f\u4ee5    | 1998.2.2 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 41 | \u5218\u4f1f\u4ee5    | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 43 | \u80e1\u4e00\u5f6a    | 1994.1.1 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 43 | \u80e1\u4e00\u5f6a    | 1994.1.1 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 43 | \u80e1\u4e00\u5f6a    | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 45 | \u738b\u963f\u7b26    | 1992.1.1 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 45 | \u738b\u963f\u7b26    | 1992.1.1 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 45 | \u738b\u963f\u7b26    | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 47 | \u738b\u7426\u5220    | 1993.1.2 | \u7537  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 47 | \u738b\u7426\u5220    | 1993.1.2 | \u7537  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 47 | \u738b\u7426\u5220    | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 49 | \u5218\u8fbe\u8fbe    | 1998.2.2 | \u5973  |        5 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 49 | \u5218\u8fbe\u8fbe    | 1998.2.2 | \u5973  |        5 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 49 | \u5218\u8fbe\u8fbe    | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n72 rows in set (0.00 sec)\n\nmysql> <\/code><\/pre>\n
\u7b49\u503c\u8fde\u63a5\uff08\u5185\u8fde\u63a5\uff09<\/h3>\n
\u7b49\u503c\u8fde\u63a5\u5c31\u662f\u5c06\u4e24\u5f20\u8868\u4e2d\u90fd\u5b58\u5728\u7684\u5217\u8fdb\u884c\u8fde\u63a5\uff0c\u5177\u4f53\u6765\u8bf4\u5c31\u662f where \u540e\u9762\u901a\u8fc7=<\/code>\u8fdb\u884c\u7b5b\u9009\u3002<\/p>\n
\u6bd4\u5982\u67e5\u8be2 Student \u548c\u5176\u6240\u5c5e Class \u4fe1\u606f\u7684\u5173\u7cfb\uff1a<\/p>\n
SELECT * FROM Student as s, Class as c where s.class_id = c.id;<\/code><\/pre>\n
mysql> SELECT * FROM Student as s, Class as c where s.class_id = c.id;\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n| id | name      | birth    | sex | class_id | id | name     | number | class_type_id |\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n|  1 | \u80e1\u4e00      | 1994.1.1 | \u7537  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  3 | \u738b\u963f      | 1992.1.1 | \u5973  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  5 | \u738b\u7426      | 1993.1.2 | \u7537  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n|  7 | \u5218\u4f1f      | 1998.2.2 | \u5973  |        1 |  1 | 1\u5e741\u73ed   |      4 |             1 |\n| 11 | \u5f20\u4f7f      | 1994.1.1 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 13 | \u738b\u963f      | 1992.1.1 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 15 | \u590f\u742a      | 1993.1.2 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 17 | \u5218\u8868      | 1998.2.2 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 19 | \u8bf8\u845b      | 1994.1.1 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 21 | \u738b\u524d      | 1992.1.1 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 23 | \u738b\u610f\u8bc6    | 1993.1.2 | \u7537  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 25 | \u5218\u7b49\u5f85    | 1998.2.2 | \u5973  |        3 |  3 | 1\u5e742\u73ed   |      8 |             3 |\n| 27 | \u80e1\u662f\u4e00    | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 29 | \u738b\u963f\u8bf7    | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 31 | \u738b\u6d88\u606f    | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 33 | \u5218\u5168      | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 35 | \u80e1\u7231      | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 37 | \u738b\u8868      | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 39 | \u738b\u534e      | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 41 | \u5218\u4f1f\u4ee5    | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 43 | \u80e1\u4e00\u5f6a    | 1994.1.1 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 45 | \u738b\u963f\u7b26    | 1992.1.1 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 47 | \u738b\u7426\u5220    | 1993.1.2 | \u7537  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n| 49 | \u5218\u8fbe\u8fbe    | 1998.2.2 | \u5973  |        5 |  5 | 1\u5e743\u73ed   |     12 |             5 |\n+----+-----------+----------+-----+----------+----+----------+--------+---------------+\n24 rows in set (0.00 sec)\n\nmysql><\/code><\/pre>\n
\u975e\u7b49\u503c\u8fde\u63a5<\/h3>\n
\u975e\u7b49\u503c\u8fde\u63a5\u5c31\u662f\u5c06\u7b49\u503c\u8fde\u63a5\u4e2d\u7684\u7b49\u53f7\u6362\u6210\u5176\u4ed6\u7684\u8fc7\u6ee4\u6761\u4ef6\u3002<\/p>\n
\u6bd4\u5982\u8fd9\u91cc\u67e5\u8be2\u6bcf\u4e2a\u73ed\u7ea7\u7684\u4fe1\u606f\u4ee5\u53ca\u6240\u5c5e\u7684\u73ed\u7ea7\u7c7b\u522b\u3002<\/p>\n
SELECT * FROM Class as c, ClassType t where c.number between t.minimum_number and maximum_number;<\/code><\/pre>\n
mysql> SELECT * FROM Class as c, ClassType t where c.number between t.minimum_number and t.maximum_number;\n+----+----------+--------+---------------+----+--------+----------------+----------------+\n| id | name     | number | class_type_id | id | name   | minimum_number | maximum_number |\n+----+----------+--------+---------------+----+--------+----------------+----------------+\n|  1 | 1\u5e741\u73ed   |      4 |             1 |  1 | \u5c0f\u73ed   |              1 |              4 |\n|  3 | 1\u5e742\u73ed   |      8 |             3 |  3 | \u4e2d\u73ed   |              5 |              8 |\n|  5 | 1\u5e743\u73ed   |     12 |             5 |  5 | \u5927\u73ed   |              9 |             12 |\n+----+----------+--------+---------------+----+--------+----------------+----------------+\n3 rows in set (0.00 sec)\n\nmysql> <\/code><\/pre>\n
\u5916\u8fde\u63a5<\/h3>\n
\u5bf9\u4e8e SQL92 \u7684\u5916\u8fde\u63a5\u6765\u8bf4\uff0c\u5728\u8fde\u63a5\u65f6\u4f1a\u5c06\u4e24\u5f20\u8868\u5206\u4e3a\u4e3b\u8868\u548c\u4ece\u8868\uff0c\u4e3b\u8868\u663e\u793a\u6240\u6709\u7684\u6570\u636e\uff0c\u4ece\u8868\u663e\u793a\u5339\u914d\u5230\u7684\u6570\u636e\uff0c\u6ca1\u6709\u5339\u914d\u5230\u7684\u5219\u663e\u793a None\u3002\u7528+<\/code>\u8868\u793a\u4ece\u8868\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u5de6\u5916\u8fde\u63a5\uff1a\u5de6\u8868\u662f\u4e3b\u8868\uff0c\u53f3\u8868\u662f\u4ece\u8868<\/p>\n
SELECT * FROM Student as s, Class as c where s.class_id = c.id(+);<\/code><\/pre>\n
\u53f3\u5916\u8fde\u63a5\uff1a\u5de6\u8868\u662f\u4ece\u8868\uff0c\u53f3\u8868\u662f\u4e3b\u8868<\/p>\n
SELECT * FROM Class as c, Student as s where c.id = s.class_id(+);<\/code><\/pre>\n
\u6ce8\u610f SQL92 \u4e2d\u5e76\u6ca1\u6709\u5168\u5916\u8fde\u63a5\u3002<\/p>\n
\u81ea\u8fde\u63a5<\/h3>\n
\u81ea\u8fde\u63a5\u4e00\u822c\u7528\u4e8e\u8fde\u63a5\u672c\u8eab\u8fd9\u5f20\u8868\uff0c\u7531\u4e8e\u5e38\u89c1\u7684 DBMS \u90fd\u4f1a\u5bf9\u81ea\u8fde\u63a5\u505a\u4e00\u4e9b\u4f18\u5316\uff0c\u6240\u4ee5\u4e00\u822c\u5728\u5b50\u67e5\u8be2\u548c\u81ea\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b\u90fd\u4f7f\u7528\u81ea\u8fde\u63a5\u3002<\/p>\n
\u6bd4\u5982\u60f3\u8981\u67e5\u8be2\u6bd41\u5e741\u73ed\u4eba\u6570\u591a\u7684\u73ed\u7ea7\uff1a<\/p>\n
\u5b50\u67e5\u8be2\uff1a<\/p>\n
SELECT * FROM Class WHERE number > (SELECT number FROM Class WHERE name="1\u5e741\u73ed");<\/code><\/pre>\n
\u81ea\u8fde\u63a5\uff1a<\/p>\n
SELECT c2.* FROM Class c1, Class c2 WHERE c1.number < c2.number and c1.name = "1\u5e741\u73ed";<\/code><\/pre>\n
mysql> SELECT * FROM Class WHERE number > (SELECT number FROM Class WHERE name="1\u5e741\u73ed");\n+----+----------+--------+---------------+\n| id | name     | number | class_type_id |\n+----+----------+--------+---------------+\n|  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  5 | 1\u5e743\u73ed   |     12 |             5 |\n+----+----------+--------+---------------+\n2 rows in set (0.00 sec)\n\nmysql> SELECT c2.* FROM Class c1, Class c2 WHERE c1.number < c2.number and c1.name = "1\u5e741\u73ed";\n+----+----------+--------+---------------+\n| id | name     | number | class_type_id |\n+----+----------+--------+---------------+\n|  3 | 1\u5e742\u73ed   |      8 |             3 |\n|  5 | 1\u5e743\u73ed   |     12 |             5 |\n+----+----------+--------+---------------+\n2 rows in set (0.00 sec)\n\nmysql> <\/code><\/pre>\n
SQL99<\/h2>\n
\u4ea4\u53c9\u8fde\u63a5<\/h3>\n
SELECT * FROM Student CROSS JOIN Class;<\/code><\/pre>\n
SELECT * FROM Student CROSS JOIN Class CROSS JOIN ClassType;<\/code><\/pre>\n
\u8fd8\u53ef\u4ee5\u5bf9\u591a\u5f20\u8868\u8fdb\u884c\u4ea4\u53c9\u8fde\u63a5\uff0c\u6bd4\u5982\u8fde\u63a5 Student\uff0cClass\uff0cClassType \u4e09\u5f20\u8868\uff0c\u7ed3\u679c\u4e3a 24  3 <\/em> 3 = 216 \u6761\u3002<\/p>\n
\u76f8\u5f53\u4e8e\u5d4c\u5957\u4e86\u4e09\u5c42 for \u5faa\u73af\u3002<\/p>\n
\u81ea\u7136\u8fde\u63a5<\/h3>\n
\u5176\u5b9e\u5c31\u662f SQL92 \u4e2d\u7684\u7b49\u503c\u8fde\u63a5\uff0c\u53ea\u4e0d\u8fc7\u8fde\u63a5\u7684\u5bf9\u8c61\u662f\u5177\u6709\u76f8\u540c\u5217\u540d\uff0c\u5e76\u4e14\u503c\u4e5f\u76f8\u540c\u7684\u5185\u5bb9\u3002<\/p>\n
SELECT * FROM Student NATURAL JOIN Class;<\/code><\/pre>\n
SELECT * FROM Student as s, Class as c where s.id = c.id;<\/code><\/pre>\n
\u5982\u679c\u60f3\u7528NATURAL JOIN<\/code>\u65f6\uff0c\u5efa\u8bae\u4e3a\u4e24\u8868\u8bbe\u7f6e\u76f8\u540c\u7684\u5217\u540d\uff0c\u6bd4\u5982 Student \u8868\u4e2d\u7684\u73ed\u7ea7\u5217\u4e3aclass_id<\/code>\uff0c\u5219\u5728 Class \u8868\u4e2d\uff0cid \u4e5f\u5e94\u6539\u4e3aclass_id<\/code>\u3002\u8fd9\u6837\u8fde\u63a5\u66f4\u5408\u7406\u4e00\u4e9b\u3002<\/p>\n
\u5982\u679c\u5927\u5bb6\u5c1d\u8bd5\uff0c\u81ea\u7136\u8fde\u63a5\u7684\u8bdd\uff0c\u4f1a\u53d1\u73b0\u67e5\u51fa\u6765\u7684\u7ed3\u679c\u96c6\u4e3a\u7a7a\uff0c\u4e0d\u8981\u5947\u602a\uff0c\u4e0b\u9762\u8bf4\u4e00\u4e0b\u539f\u56e0\uff1a<\/p>\n
mysql> SELECT * FROM Student NATURAL JOIN Class;\nEmpty set (0.00 sec)<\/code><\/pre>\n
\u8fd9\u662f\u56e0\u4e3a\uff0cNATURAL JOIN<\/code>\u4f1a\u81ea\u52a8\u8fde\u63a5\u4e24\u5f20\u8868\u4e2d\u76f8\u540c\u7684\u5217\u540d\uff0c\u800c\u5bf9\u4e8e Student \u548c Class \u4e24\u5f20\u8868\u6765\u8bf4\uff0cid \u548c name \u5728\u8fd9\u4e24\u5f20\u8868\u90fd\u662f\u76f8\u540c\u7684\uff0c\u6240\u4ee5\u65e2\u6ee1\u8db3 id \u53c8\u6ee1\u8db3 name \u7684\u884c\u662f\u4e0d\u5b58\u5728\u7684\u3002<\/p>\n
\u76f8\u5f53\u4e8e SQL \u53d8\u6210\u4e86\u8fd9\u6837<\/p>\n
SELECT * FROM Student as s, Class as c where s.id = c.id and s.name = c.name;<\/code><\/pre>\n
ON \u8fde\u63a5<\/h3>\n
ON \u8fde\u63a5\u5176\u5b9e\u5bf9\u4e86 SQL92 \u4e2d\u7684\u7b49\u503c\u8fde\u63a5\u548c\u975e\u7b49\u503c\u8fde\u63a5\uff1a<\/p>\n
\u7b49\u503c\u8fde\u63a5\uff1a<\/p>\n
SELECT * FROM Student as s JOIN Class as c ON s.class_id = c.id;<\/code><\/pre>\n
or<\/p>\n
SELECT * FROM Student as s INNER JOIN Class as c ON s.class_id = c.id;<\/code><\/pre>\n
\u975e\u7b49\u503c\u8fde\u63a5\uff1a<\/p>\n
SELECT * FROM Class as c JOIN ClassType t ON c.number between t.minimum_number and maximum_number;<\/code><\/pre>\n
USING \u8fde\u63a5<\/h3>\n
\u548cNATURAL JOIN<\/code>\u5f88\u50cf\uff0c\u53ef\u4ee5\u624b\u52a8\u6307\u5b9a\u5177\u6709\u76f8\u540c\u5217\u540d\u7684\u5217\u8fdb\u884c\u8fde\u63a5\uff1a<\/p>\n
SELECT * FROM Student JOIN Class USING(id);<\/code><\/pre>\n
mysql> SELECT * FROM Student JOIN Class USING(id);\n+----+--------+----------+-----+----------+----------+--------+---------------+\n| id | name   | birth    | sex | class_id | name     | number | class_type_id |\n+----+--------+----------+-----+----------+----------+--------+---------------+\n|  1 | \u80e1\u4e00   | 1994.1.1 | \u7537  |        1 | 1\u5e741\u73ed   |      4 |             1 |\n|  3 | \u738b\u963f   | 1992.1.1 | \u5973  |        1 | 1\u5e742\u73ed   |      8 |             3 |\n|  5 | \u738b\u7426   | 1993.1.2 | \u7537  |        1 | 1\u5e743\u73ed   |     12 |             5 |\n+----+--------+----------+-----+----------+----------+--------+---------------+\n3 rows in set (0.00 sec)\n\nmysql> <\/code><\/pre>\n
\u8fd9\u65f6\u5c31\u89e3\u51b3\u4e86\u4e4b\u524d\u5217\u5b58\u5728\u91cd\u540d\uff0c\u65e0\u6cd5\u8fde\u63a5\u7684\u60c5\u51b5\u3002<\/p>\n
\u5916\u8fde\u63a5<\/h3>\n
\u5de6\u5916\u8fde\u63a5: \u5de6\u8868\u662f\u4e3b\u8868\uff0c\u53f3\u8868\u662f\u4ece\u8868<\/p>\n
SELECT * FROM Student as s LEFT JOIN Class as c on s.class_id = c.id;\nOR\nSELECT * FROM Student as s LEFT OUTER JOIN Class as c on s.class_id = c.id;<\/code><\/pre>\n
\u53f3\u5916\u8fde\u63a5\uff1a\u5de6\u8868\u662f\u4ece\u8868\uff0c\u53f3\u8868\u662f\u4e3b\u8868<\/p>\n
SELECT * FROM Student as s RIGHT JOIN Class as c on s.class_id = c.id;\nOR\nSELECT * FROM Student as s RIGHT OUTER JOIN Class as c on s.class_id = c.id;<\/code><\/pre>\n
\u5168\u5916\u8fde\u63a5: \u5de6\u5916\u8fde\u63a5 + \u53f3\u5916\u7684\u8fde\u63a5\u7684\u5408\u96c6<\/p>\n
SELECT * FROM Student as s FULL JOIN Class as c ON s.class_id = c.id;<\/code><\/pre>\n
\n
MySQL \u4e2d\u6ca1\u6709\u5168\u5916\u8fde\u63a5\u7684\u6982\u5ff5<\/p>\n<\/blockquote>\n
\u81ea\u8fde\u63a5\uff1a<\/p>\n
SELECT c2.* FROM Class c1 JOIN Class c2 ON c1.number < c2.number and c1.name = "1\u5e741\u73ed";<\/code><\/pre>\n
SQL92 \u548c SQL99 \u7684\u5bf9\u6bd4<\/h2>\n
    \n
  1. \n
    SQL92 \u4e2d\u7684\u7b49\u503c\u8fde\u63a5\uff08\u5185\u8fde\u63a5\uff09\uff0c\u975e\u7b49\u503c\u8fde\u63a5\uff0c\u81ea\u8fde\u63a5\u5bf9\u5e94\u4e86 SQL99 \u7684 ON \u8fde\u63a5\uff0c\u7528\u4e8e\u7b5b\u9009\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u6570\u636e\u884c\u3002<\/p>\n<\/li>\n
  2. \n
    SQL92 \u7684\u7b1b\u5361\u5c14\u79ef\u8fde\u63a5\uff0c\u5bf9\u5e94\u4e86 SQL99 \u7684\u4ea4\u53c9\u8fde\u63a5\u3002<\/p>\n<\/li>\n
  3. \n
    SQL92 \u4e2d\u7684\u5916\u8fde\u63a5\u5e76\u4e0d\u5305\u542b\u5168\u5916\u8fde\u63a5\uff0c\u800c SQL99 \u652f\u6301\uff0c\u5e76\u4e14\u5c06 SQL92 \u4e2d WHERE \u6362\u4e3a SQL99 \u7684 ON\u3002\u8fd9\u6837\u7684\u597d\u5904\u53ef\u4ee5\u66f4\u6e05\u6670\u7684\u8868\u8fbe\u8fde\u63a5\u8868\u7684\u8fc7\u7a0b\uff0c\u66f4\u76f4\u89c2\u3002<\/p>\n<\/li>\n<\/ol>\n
    SELECT ...\nFROM table1\n    JOIN table2 ON filter_condition\n        JOIN table3 ON filter_condition<\/code><\/pre>\n
      \n
    1. SQL99 \u591a\u4e86\u81ea\u7136\u8fde\u63a5\u548c USING \u8fde\u63a5\u7684\u8fc7\u7a0b\uff0c\u4e24\u8005\u7684\u533a\u522b\u662f\u662f\u5426\u9700\u8981\u663e\u5f0f\u7684\u6307\u5b9a\u5217\u540d\u3002<\/li>\n<\/ol>\n
      \u603b\u7ed3<\/h2>\n
      \u6211\u4eec\u77e5\u9053\uff0c\u5728 SQL \u4e2d\uff0c\u6309\u7167\u5e74\u4efd\u5212\u5206\u4e86\u4e0d\u540c\u7684\u6807\u51c6\uff0c\u5176\u4e2d\u6700\u4e3a\u5e38\u7528\u7684\u662f SQL-92 \u548c SQL-99 \u4e24\u4e2a\u6807\u51c6\u3002<\/p>\n
      \u63a5\u7740\uff0c\u5bf9\u6bd4\u4e86 92 \u548c 99 \u4e24\u8005\u7684\u4e0d\u540c\uff0c\u53d1\u73b0 99 \u7684\u6807\u51c6\u5728\u8fde\u63a5\u65f6\uff0c\u66f4\u52a0\u7b26\u5408\u903b\u8f91\u5e76\u4e14\u66f4\u52a0\u76f4\u89c2\u3002<\/p>\n
      \n
      \u8f6c\u8f7d\u81f3\uff1ahttps:\/\/www.cnblogs.com\/michael9\/p\/13166575.html<\/a><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
      \u73b0\u5728\u968f\u7740\u5404\u79cd\u6570\u636e\u5e93\u6846\u67b6\u7684\u76db\u884c\uff0c\u5728\u63d0\u9ad8\u6548\u7387\u7684\u540c\u65f6\u4e5f\u8ba9\u6211\u4eec\u5ffd\u7565\u4e86\u5f88\u591a\u5e95\u5c42\u7684\u8fde\u63a5\u8fc7\u7a0b\uff0c\u8fd9\u7bc7\u6587\u7ae0\u662f\u5bf9 SQL \u8fde\u63a5\u8fc7\u7a0b […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-2085","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2085","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2085"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2085\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2085"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}