{"id":1752,"date":"2016-11-03T14:54:45","date_gmt":"2016-11-03T06:54:45","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=1752"},"modified":"2016-11-03T17:04:36","modified_gmt":"2016-11-03T09:04:36","slug":"mysql%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=1752","title":{"rendered":"mysql\u591a\u8868\u67e5\u8be2"},"content":{"rendered":"

\u591a\u8868\u67e5\u8be2\u5c31\u662f\u5728\u591a\u4e2a\u6709\u903b\u8f91\u8054\u7cfb\u7684\u8868\u4e4b\u95f4\u8fdb\u884c\u7684\u67e5\u8be2\uff0c\u903b\u8f91\u5173\u7cfb\u4e3b\u8981\u662f\u6307\u4e3b\u5916\u952e\u4e4b\u95f4\u7684\u8054\u7cfb<\/strong>\uff0c \u5728\u4e3b\u8868\u4e2d\u7684\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\u53d6\u81ea\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u6bb5\uff0c\u5c31\u662f\u8bf4\u4e3b\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u6bb5\u7684\u503c\u5305\u542b\u4e8e\u53e6\u4e00\u4e2a\u8868\u7684\u4e00\u4e2a\u5b57\u6bb5\u7684\u503c\u7684\u96c6\u5408\u91cc \u3002\u8fd9\u6837\u7684\u8bdd\uff0c\u5982\u679c\u8981\u5728\u4e3b\u8868\u91cc\u63d2\u5165\u6570\u636e\uff0c\u5c31\u5fc5\u987b\u662f\u5bf9\u5e94\u7684\u5b57\u6bb5\u7684\u503c\u5728\u76f8\u5e94\u7684\u8868\u4e2d\u5b58\u5728\uff0c\u624d\u6709\u53ef\u80fd\u63d2\u5165\u6210\u529f\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u80af\u5b9a\u63d2\u5165\u4e0d\u6210\u529f\uff08\u9664\u975e\u6b64\u5b57\u6bb5\u53ef\u4ee5\u4e3a\u7a7a\uff09 \u3002\u8981\u5b9e\u73b0\u591a\u8868\u4e4b\u95f4\u7684\u67e5\u8be2\u5c31\u8981\u4f9d\u9760\u8868\u8fde\u63a5\u6216\u8005\u662f\u5b50\u67e5\u8be2\u7684\u65b9\u5f0f\u5b9e\u73b0\uff1a<\/p>\n

\u5047\u8bbe\u6709\u4e24\u5f20\u8868\u5458\u5de5\u8868\u548c\u90e8\u95e8\u8868,\u8868\u7ed3\u6784\u5982\u4e0b:<\/p>\n

[java]
\n\u90e8\u95e8\u8868:<\/p>\n

CREATE TABLE `deparment` (
\n `id` int(11) NOT NULL AUTO_INCREMENT,
\n `deparment_name` varchar(255) NOT NULL,
\n `deparment_num` varchar(255) NOT NULL,
\n `deparment_des` varchar(255) DEFAULT NULL,
\n PRIMARY KEY (`id`)
\n )<\/p>\n

mysql> desc deparment;
\n+—————-+————–+——+—–+———+—————-+
\n| Field | Type | Null | Key | Default | Extra |
\n+—————-+————–+——+—–+———+—————-+
\n| id | int(11) | NO | PRI | NULL | auto_increment |
\n| deparment_name | varchar(255) | NO | | NULL | |
\n| deparment_num | varchar(255) | NO | | NULL | |
\n| deparment_des | varchar(255) | YES | | NULL | |
\n+—————-+————–+——+—–+———+—————-+<\/p>\n

=================\u63d2\u5165\u8bb0\u5f55=========================<\/p>\n

INSERT INTO `deparment` VALUES (‘1’, ‘\u4eba\u4e8b\u90e8’, ‘A1001’, ‘\u5904\u7406\u4eba\u4e8b\u5173\u7cfb’);
\nINSERT INTO `deparment` VALUES (‘2’, ‘\u8d22\u52a1\u90e8’, ‘B2001’, ‘\u7ba1\u7406\u516c\u53f8\u8d44\u4ea7’);
\nINSERT INTO `deparment` VALUES (‘3’, ‘\u884c\u653f\u90e8’, ‘C3001’, ‘\u5236\u8ba2\u89c4\u7ae0\u5236\u5ea6’);<\/p>\n

mysql> select * from employe;
\n+—-+——+——+
\n| id | name | d_id |
\n+—-+——+——+
\n| 5 | \u5f20\u4e09 | 1 |
\n| 6 | \u674e\u56db | 1 |
\n| 7 | \u738b\u4e8c | 1 |
\n| 8 | \u9ebb\u5b50 | 2 |
\n| 9 | \u5c0f\u660e | 3 |
\n+—-+——+——+<\/p>\n

\u5458\u5de5\u8868:<\/p>\n

CREATE TABLE `employe` (
\n `id` int(11) NOT NULL AUTO_INCREMENT,
\n `name` varchar(255) NOT NULL,
\n `d_id` int(11) NOT NULL DEFAULT ‘1’,
\n PRIMARY KEY (`id`),
\n KEY `fk` (`d_id`),
\n)<\/p>\n

mysql> desc employe;
\n+——-+————–+——+—–+———+—————-+
\n| Field | Type | Null | Key | Default | Extra |
\n+——-+————–+——+—–+———+—————-+
\n| id | int(11) | NO | PRI | NULL | auto_increment |
\n| name | varchar(255) | NO | | NULL | |
\n| d_id | int(11) | NO | MUL | 1 | |
\n+——-+————–+——+—–+———+—————-+<\/p>\n

=================\u63d2\u5165\u8bb0\u5f55=========================<\/p>\n

INSERT INTO `employe` VALUES (‘5’, ‘\u5f20\u4e09’, ‘1’);
\nINSERT INTO `employe` VALUES (‘6’, ‘\u674e\u56db’, ‘1’);
\nINSERT INTO `employe` VALUES (‘7’, ‘\u738b\u4e8c’, ‘1’);
\nINSERT INTO `employe` VALUES (‘8’, ‘\u9ebb\u5b50’, ‘2’);
\nINSERT INTO `employe` VALUES (‘9’, ‘\u5c0f\u660e’, ‘3’);<\/p>\n

mysql> select * from employe;
\n+—-+——+——+
\n| id | name | d_id |
\n+—-+——+——+
\n| 5 | \u5f20\u4e09 | 1 |
\n| 6 | \u674e\u56db | 1 |
\n| 7 | \u738b\u4e8c | 1 |
\n| 8 | \u9ebb\u5b50 | 2 |
\n| 9 | \u5c0f\u660e | 3 |
\n+—-+——+——+
\n[\/java]<\/p>\n

\u8868\u8fde\u63a5\u67e5\u8be2\uff1a<\/h2>\n

\u666e\u901a\u591a\u8868\u67e5\u8be2\uff1a<\/h3>\n

[java] select \u52171… from \u88681\uff0c\u88682… where condition…[\/java]
\n\u8bed\u6cd5\uff1a \u5728from\u4e4b\u540e\u53ef\u4ee5\u6709\u5f88\u591a\u8868\uff0c\u6bcf\u4e2a\u8868\u4e4b\u95f4\u7528\uff0c\u9694\u5f00\uff0cfrom\u540e\u9762\u7684\u8868\u4f1a\u505a\u7b1b\u5361\u5c14\u79ef
\n\u8868\u4e0e\u8868\u4e4b\u95f4\u505a\u7b1b\u5361\u5c14\u79ef\uff0c\u7136\u540e\u5c31\u80fd\u67e5\u8be2\u51fa\u6765\u4e86
\n[java]
\n mysql> select * from employe,deparment where employe.d_id = deparment.id;
\n+—-+——+——+—-+—————-+—————+—————+
\n| id | name | d_id | id | deparment_name | deparment_num | deparment_des |
\n+—-+——+——+—-+—————-+—————+—————+
\n| 5 | \u5f20\u4e09 | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 6 | \u674e\u56db | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 7 | \u738b\u4e8c | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 8 | \u9ebb\u5b50 | 2 | 2 | \u8d22\u52a1\u90e8 | B2001 | \u7ba1\u7406\u516c\u53f8\u8d44\u4ea7 |
\n| 9 | \u5c0f\u660e | 3 | 3 | \u884c\u653f\u90e8 | C3001 | \u5236\u8ba2\u89c4\u7ae0\u5236\u5ea6 |
\n+—-+——+——+—-+—————-+—————+—————+[\/java]<\/p>\n

\u5185\u8fde\u63a5\uff1a<\/h3>\n

[java]select \u5217\u540d1,… from \u88681 inner join \u88682 on \u88681.\u5217=\u88682.\u5217\uff0c…condition…
\n[\/java]
\n\u8bed\u6cd5\uff1afrom\u5f00\u59cb\uff0c\u88681\u4e0e\u88682\u8fdb\u884c\u7b1b\u5361\u5c14\u79ef\uff0c\u6bcf\u5339\u914d\u4e00\u884c\u7684\u6570\u636e\uff0c\u5c31\u4f1a\u901a\u8fc7on\u540e\u6761\u4ef6\u5224\u65ad
\n\u662f\u5426\u6210\u7acb\uff0c\u5c31\u5c06\u8be5\u884c\u5339\u914d\u7684\u4fe1\u606f\u5b58\u653e\u5230\u4e34\u65f6\u8868\uff0c\u5426\u5219\u4e0d\u5b58\u653e
\n[java]mysql> SELECT * FROM employe AS e INNER JOIN deparment AS d ON e.d_id = d.id;
\n+—-+——+——+—-+—————-+—————+—————+
\n| id | name | d_id | id | deparment_name | deparment_num | deparment_des |
\n+—-+——+——+—-+—————-+—————+—————+
\n| 5 | \u5f20\u4e09 | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 6 | \u674e\u56db | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 7 | \u738b\u4e8c | 1 | 1 | \u4eba\u4e8b\u90e8 | A1001 | \u5904\u7406\u4eba\u4e8b\u5173\u7cfb |
\n| 8 | \u9ebb\u5b50 | 2 | 2 | \u8d22\u52a1\u90e8 | B2001 | \u7ba1\u7406\u516c\u53f8\u8d44\u4ea7 |
\n| 9 | \u5c0f\u660e | 3 | 3 | \u884c\u653f\u90e8 | C3001 | \u5236\u8ba2\u89c4\u7ae0\u5236\u5ea6 |
\n+—-+——+——+—-+—————-+—————+—————+
\n[\/java]<\/p>\n

\u5916\u8fde\u63a5\uff1a<\/h3>\n

\u5de6\u5916\u8fde\u63a5<\/big>\uff1a\u5de6\u8868\u4e2d\u6240\u6709\u7684\u8bb0\u5f55\u90fd\u4f1a\u88ab\u653e\u5230\u7ed3\u679c`\u96c6\u4e2d\uff0c\u65e0\u8bba\u662f\u5426\u5728\u53f3\u8868\u662f\u5426\u5b58\u5728\u5339\u914d\u8bb0\u5f55
\n\u8bed\u6cd5\uff1aselect \u5217 from \u88681 left outer join \u88682 on \u88681.\u5217=\u88682.\u5217
\n [left outer join \u88683 on…]<\/p>\n

[java]mysql> SELECT e.name,d.deparment_name FROM employe AS e
\n -> LEFT OUTER JOIN deparment AS d
\n -> ON e.d_id = d.id;
\n+——+—————-+
\n| name | deparment_name |
\n+——+—————-+
\n| \u5f20\u4e09 | \u4eba\u4e8b\u90e8 |
\n| \u674e\u56db | \u4eba\u4e8b\u90e8 |
\n| \u738b\u4e8c | \u4eba\u4e8b\u90e8 |
\n| \u9ebb\u5b50 | \u8d22\u52a1\u90e8 |
\n| \u5c0f\u660e | \u884c\u653f\u90e8 |
\n| \u5c0f\u4e3d | NULL |
\n+——+—————-+[\/java]<\/p>\n

\u53f3\u5916\u8fde\u63a5<\/big>\uff1a\u4e0d\u7ba1\u662f\u5426\u6210\u529f\u5339\u914d\u8fde\u63a5\u6761\u4ef6\u90fd\u4f1a\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55
\n\u8bed\u6cd5\uff1a select \u5217 from \u88681 right outer join \u88682 on \u88681.\u5217=\u88682.\u5217
\n [right outer join \u88683 on…]<\/p>\n

[java]mysql> SELECT e.name,d.deparment_name FROM employe AS e
\n -> RIGHT OUTER JOIN deparment AS d
\n -> ON e.d_id = d.id;
\n+——+—————-+
\n| name | deparment_name |
\n+——+—————-+
\n| \u5f20\u4e09 | \u4eba\u4e8b\u90e8 |
\n| \u674e\u56db | \u4eba\u4e8b\u90e8 |
\n| \u738b\u4e8c | \u4eba\u4e8b\u90e8 |
\n| \u9ebb\u5b50 | \u8d22\u52a1\u90e8 |
\n| \u5c0f\u660e | \u884c\u653f\u90e8 |
\n| NULL | \u9500\u552e\u90e8 |
\n+——+—————-+
\n[\/java]<\/p>\n

\u5168\u5916\u8fde\u63a5\uff1a\u5728mysql\u4e2d\u6ca1\u6709\u5168\u5916\u8fde\u63a5<\/p>\n

\u81ea\u8fde\u63a5\uff1a<\/h3>\n

\u4e00\u5f20\u8868\u4e0e\u81ea\u5df1\u8fdb\u884c\u8fde\u63a5\uff0c
\nex:\u67e5\u627e\u6bcf\u4e2a\u5458\u5de5\u7684\u76f4\u63a5\u4e0a\u7ea7\u9886\u5bfc\u7684\u59d3\u540d<\/p>\n

[java]mysql> CREATE TABLE people(
\n -> id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
\n -> name varchar(50) NOT NULL,
\n -> parent_id int DEFAULT 0);<\/p>\n

mysql> DESC people;
\n+———–+————-+——+—–+———+—————-+
\n| Field | Type | Null | Key | Default | Extra |
\n+———–+————-+——+—–+———+—————-+
\n| id | int(11) | NO | PRI | NULL | auto_increment |
\n| name | varchar(50) | NO | | NULL | |
\n| parent_id | int(11) | YES | | 0 | |
\n+———–+————-+——+—–+———+—————-+<\/p>\n

mysql> SELECT * FROM people;
\n+—-+——–+———–+
\n| id | name | parent_id |
\n+—-+——–+———–+
\n| 1 | \u8303\u603b | 0 |
\n| 2 | \u4f55\u7ecf\u7406 | 1 |
\n| 3 | \u9ebb\u4e3b\u7ba1 | 2 |
\n| 4 | \u5218\u4e3b\u7ba1 | 2 |
\n| 5 | \u674e\u9ad8\u7ea7 | 3 |
\n| 6 | \u738b\u4e2d\u7ea7 | 3 |
\n| 7 | \u5f20\u521d\u7ea7 | 4 |
\n+—-+——–+———–+<\/p>\n

\u67e5\u8be2\u5218\u4e3b\u7ba1\u7684\u4e0a\u7ea7\u9886\u5bfc:<\/p>\n

mysql> SELECT s.name AS \u59d3\u540d,f.name AS \u9886\u5bfc FROM people AS s
\n -> INNER JOIN people AS f
\n -> ON s.parent_id = f.id
\n -> AND s.name=’\u5218\u4e3b\u7ba1’;
\n+——–+——–+
\n| \u59d3\u540d | \u9886\u5bfc
\n+——–+——–+
\n| \u5218\u4e3b\u7ba1 | \u4f55\u7ecf\u7406
\n+——–+——–+[\/java]<\/p>\n

\u5546\u57ce\u5546\u54c1\u5206\u7c7b\u5b9e\u4f8b<\/p>\n

[java]mysql> select * from product;
\n+————+—————-+——————-+
\n| product_id | product_name | product_parent_id |
\n+————+—————-+——————-+
\n| 1 | \u5929\u732b\u5546\u54c1 | 0 |
\n| 2 | \u5973\u88c5\/\u5185\u8863 | 1 |
\n| 3 | \u7537\u88c5\/\u8fd0\u52a8\u6237\u5916 | 1 |
\n| 4 | \u5bb6\u5177\u5efa\u6750 | 1 |
\n| 5 | \u6c7d\u8f66\/\u914d\u4ef6\/\u7528\u54c1 | 1 |
\n| 6 | \u56fe\u4e66\u97f3\u50cf | 1 |
\n| 7 | \u5f53\u5b63\u6d41\u884c | 2 |
\n| 8 | \u7cbe\u9009\u4e0a\u88c5 | 2 |
\n| 9 | \u6d6a\u6f2b\u88d9\u88c5 | 2 |
\n| 10 | \u5973\u58eb\u4e0b\u88c5 | 2 |
\n| 11 | \u6210\u5957\u5bb6\u5177 | 4 |
\n| 12 | \u5ba2\u5385\u9910\u5385 | 4 |
\n+————+—————-+——————-+
\n12 rows in set (0.02 sec)<\/p>\n

\u67e5\u8be2\u5973\u58eb\u4e0b\u88c5\u5206\u7c7b\u7684\u4e0a\u7ea7\u5206\u7c7b:<\/p>\n

mysql> SELECT s.product_name, f.product_name FROM product AS s
\n -> INNER JOIN product AS f
\n -> ON s.product_parent_id = f.product_id
\n -> AND s.product_name=’\u5973\u58eb\u4e0b\u88c5’;
\n+————–+————–+
\n| product_name | product_name |
\n+————–+————–+
\n| \u5973\u58eb\u4e0b\u88c5 | \u5973\u88c5\/\u5185\u8863 |
\n+————–+————–+[\/java]<\/p>\n

\u5b50\u67e5\u8be2\uff1a<\/h3>\n

\u5728\u67e5\u8be2\u4e2d\u8fd8\u53ef\u4ee5\u6709\u67e5\u8be2\u3002\u5916\u67e5\u8be2\u53eb\u4e3b\u67e5\u8be2\uff0c\u5185\u90e8\u7684\u53eb\u5b50\u67e5\u8be2
\n\u5b50\u67e5\u8be2\u5148\u8fd0\u884c\uff0c\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u4f5c\u4e3a\u4e3b\u67e5\u8be2\u7684\u503c\u4f7f\u7528
\n–\u5b50\u67e5\u8be2\u8fd4\u56de\u5355\u4e2a\u503c\u00a0\u00a0 =
\n–\u5b50\u67e5\u8be2\u8fd4\u56de\u591a\u884c\u4e00\u5217\u00a0 in
\n–\u5b50\u67e5\u8be2\u8fd4\u56de\u4e00\u884c\u591a\u5217\u00a0 \uff08\uff0c\uff09in\uff08\uff0c\uff09
\n–\u5b50\u67e5\u8be2\u8fd4\u56de\u591a\u884c\u591a\u5217\u00a0\u00a0 \u5c06\u6761\u4ef6\u4e00\u4e2a\u4e00\u4e2a\u62c6\u5f00\uff0c\u7136\u540e\u5c06\u5b50\u67e5\u8be2\u5f97\u5230\u7684\u8868\u5728\u8fdb\u884c\u8fde\u63a5
\n\u8fde\u63a5\u4e4b\u540e\u53ef\u6309\u4e0b\u4e00\u6b65\u7684\u6761\u4ef6\u8fdb\u884c\u67e5\u8be2\uff0c\u4ee5\u6b64\u7c7b\u63a8\u4e0b\u53bb\u5373\u53ef\u5f97\u5230
\n\u7b26\u5408\u6761\u4ef6\u7684\u7ed3\u679c\u3002\u5728\u6761\u4ef6\u62c6\u5206\u7684\u65f6\u5019\u5c31\u662f\u8981\u6708\u7b80\u5355\u8d8a\u597d\uff0c\u5e76\u4e14
\n\u6761\u4ef6\u4e4b\u95f4\u6709\u76f8\u5e94\u7684\u5173\u7cfb\uff0c\u6700\u597d\u662f\u5305\u542b\u7684\u5173\u7cfb\uff0c\u8fd9\u6837\u67e5\u8be2\u51fa\u6765\u7684
\n\u7ed3\u679c\u80af\u5b9a\u662f\u6ca1\u6709\u9519\u7684\uff0c\u5e76\u4e14\u5728\u903b\u8f91\u4e0a\u4e5f\u662f\u5f88\u901a\u7684\u3002\u4e5f\u5c31\u5404\u79cd\u5b50\u67e5\u8be2
\n\u5e76\u5217\u6216\u8005\u662f\u4e00\u4e2a\u662f\u53e6\u4e00\u4e2a\u7684\u5b50\u67e5\u8be2\u3002<\/p>\n

\u67e5\u8be2\u4eba\u4e8b\u90e8\u6240\u6709\u5458\u5de5\u59d3\u540d:
\n[java]
\nmysql> SELECT name AS \u59d3\u540d FROM employe AS e
\n -> WHERE e.d_id = (SELECT id FROM deparment AS d WHERE d.deparment_name=’\u4eba\u4e8b\u90e8’);
\n+——+
\n| \u59d3\u540d |
\n+——+
\n| \u5f20\u4e09 |
\n| \u674e\u56db |
\n| \u738b\u4e8c |
\n+——+
\n[\/java]<\/p>\n

\u6ce8\u610f\uff1a\u7b1b\u5361\u5c14\u79ef\u53c8\u53eb\u76f4\u79ef\u3002
\n\u5047\u8bbe\u96c6\u5408A={a,b}\uff0c\u96c6\u5408B={0,1,2}\uff0c\u5219\u4e24\u4e2a\u96c6\u5408\u7684\u7b1b\u5361\u5c14\u79ef\u4e3a{(a,0),(a,1),(a,2),(b,0),(b,1),(b,2)}\u3002\u53ef\u4ee5\u6269\u5c55\u5230\u591a\u4e2a\u96c6\u5408\u7684\u60c5\u51b5\u3002
\n\u7c7b\u4f3c\u7684\u4f8b\u5b50\u6709\uff0c\u5982\u679cA\u8868\u793a\u67d0\u5b66\u6821\u5b66\u751f\u7684\u96c6\u5408\uff0cB\u8868\u793a\u8be5\u5b66\u6821\u6240\u6709\u8bfe\u7a0b\u7684\u96c6\u5408\uff0c\u5219A\u4e0eB\u7684\u7b1b\u5361\u5c14\u79ef\u8868\u793a\u6240\u6709\u53ef\u80fd\u7684\u9009\u8bfe\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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