mysql怎么查某表主键,查询数据库表主键
mysql 怎么查询某个表最后一个主键的值？
知道字段名吗？
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第一，查出主键名，
第二，使用主键来select.
SELECT
t.TABLE_NAME,
t.CONSTRAINT_TYPE,
c.COLUMN_NAME,
c.ORDINAL_POSITION
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS t,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
WHERE
t.TABLE_NAME = c.TABLE_NAME
AND t.TABLE_SCHEMA = 'test'
AND t.CONSTRAINT_TYPE = 'PRIMARY KEY';
MYSQL查询表的主键
SELECT
t.TABLE_NAME,
t.CONSTRAINT_TYPE,
c.COLUMN_NAME,
c.ORDINAL_POSITION
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS t,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
WHERE
t.TABLE_NAME = c.TABLE_NAME
AND t.TABLE_SCHEMA = 'test'
AND t.CONSTRAINT_TYPE = 'PRIMARY KEY';
测试执行结果如下:
mysql SELECT
- t.TABLE_NAME,
- t.CONSTRAINT_TYPE,
- c.COLUMN_NAME,
- c.ORDINAL_POSITION
- FROM
- INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS t,
- INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
- WHERE
- t.TABLE_NAME = c.TABLE_NAME
- AND t.TABLE_SCHEMA = 'test'
- AND t.CONSTRAINT_TYPE = 'PRIMARY KEY'
- LIMIT 3;
+------------+-----------------+-------------+------------------+
| TABLE_NAME | CONSTRAINT_TYPE | COLUMN_NAME | ORDINAL_POSITION |
+------------+-----------------+-------------+------------------+
| mr_dept | PRIMARY KEY | dept_id | 1 |
| order | PRIMARY KEY | id | 1 |
| tab | PRIMARY KEY | id | 1 |
+------------+-----------------+-------------+------------------+
3 rows in set (0.06 sec)
mysql 主键查询是怎么查的
SELECT
t.TABLE_NAME,
t.CONSTRAINT_TYPE,
c.COLUMN_NAME,
c.ORDINAL_POSITION
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS t,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
WHERE
t.TABLE_NAME = c.TABLE_NAME
AND t.TABLE_SCHEMA = 'test'
AND t.CONSTRAINT_TYPE = 'PRIMARY KEY';
测试执行结果如下:
mysql SELECT
- t.TABLE_NAME,
- t.CONSTRAINT_TYPE,
- c.COLUMN_NAME,
- c.ORDINAL_POSITION
- FROM
- INFORMATION_SCHEMA.TABLE_CONSTRAINTS AS t,
- INFORMATION_SCHEMA.KEY_COLUMN_USAGE AS c
- WHERE
- t.TABLE_NAME = c.TABLE_NAME
- AND t.TABLE_SCHEMA = 'test'
- AND t.CONSTRAINT_TYPE = 'PRIMARY KEY'
- LIMIT 3;
+------------+-----------------+-------------+------------------+
| TABLE_NAME | CONSTRAINT_TYPE | COLUMN_NAME | ORDINAL_POSITION |
+------------+-----------------+-------------+------------------+
| mr_dept | PRIMARY KEY | dept_id | 1 |
| order | PRIMARY KEY | id | 1 |
| tab | PRIMARY KEY | id | 1 |
+------------+-----------------+-------------+------------------+
3 rows in set (0.06 sec)
怎么看MYSQL表的主键
楼主用的什么样的客户端程序？不同的客户端程序查看的方式可能不一样。我用Navicat。选择表后点右键---选择设计表，在字段后面有个黄色的钥匙，那个字段就是主键。
尽管客户端不同，但查看应该都是在设计表中。
如何查看mysql中一张表的主键、字段是否为空等信息
用命令：DESCRIBE 数据库名.表名;
结果：
+------------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------------+--------------+------+-----+---------+-------+
| product_id | int(11) | NO | PRI | NULL | |
| name | varchar(255) | NO | MUL | NULL | |
| description | text | NO | | NULL | |
| meta_title | varchar(255) | NO | | NULL | |
+------------------+--------------+------+-----+---------+-------+
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