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您如何获取列是否是MySQL中的主键？

2024-05-10 05:31:04 330

要获取列是否为主键，请使用COLUMN_NAME和COLUMN_KEY='PRI'。这样，整个语法如下：

select column_name, case when column_key= 'PRI' then 'yourMessage1' else ''yourMessage2' end as anyAliasName
from information_schema.columns
where table_schema =database()
and `table_name` = yourTableName
order by `table_name`, ordinal_position;

要了解上述语法，让我们创建一个表-

mysql> create table DemoTable1886
   (
   Id int NOT NULL,
   FirstName varchar(20),
   LastName varchar(20),
   Age int,
   DateOfBirth datetime,
   Education varchar(40),
   PRIMARY KEY(Id)
   );

这是获取特定列是否为主键的查询-

mysql> select column_name, case when column_key= 'PRI' then 'This is a Primary key Column' else 'This is not a Primary key Column' end as Output
   from information_schema.columns
   where table_schema =database()
   and `table_name` = 'DemoTable1886'
   order by `table_name`, ordinal_position;

这将产生以下输出-

+-------------+--------------------------------+
| COLUMN_NAME | Output                         |
+-------------+--------------------------------+
| Id          | This is a Primary key Column   |
| FirstName   |This is not a Primary key Column|
| LastName    |This is not a Primary key Column|
| Age         |This is not a Primary key Column|
| DateOfBirth |This is not a Primary key Column|
| Education   |This is not a Primary key Column|
+-------------+--------------------------------+
6 rows in set (0.00 sec)

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您如何获取列是否是MySQL中的主键？

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