Question

我正在尝试运行查询以检查列是否自动递增。我可以检查类型，默认值，它是否可以为空等等，但我无法弄清楚如何自动递增测试。以下是我测试其他内容的方法：

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'my_table'
AND COLUMN_NAME = 'my_column'
AND DATA_TYPE = 'int'
AND COLUMN_DEFAULT IS NULL
AND IS_NULLABLE = 'NO'
--AND AUTO_INCREMENTS = 'YES'

很遗憾，没有AUTO_INCREMENTS列可供比较。那么如何测试列自动增量？

Answer 1

对于MySql，请检入EXTRA列：

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'my_table'
    AND COLUMN_NAME = 'my_column'
    AND DATA_TYPE = 'int'
    AND COLUMN_DEFAULT IS NULL
    AND IS_NULLABLE = 'NO'
    AND EXTRA like '%auto_increment%'

对于Sql Server，请使用sys.columns和is_identity列：

SELECT 
    is_identity
FROM sys.columns
WHERE 
    object_id = object_id('my_table')
    AND name = 'my_column'

Answer 2

假设MySQL，EXTRA列将指示它是否为AUTO_INCREMENT。

| TABLE_CATALOG | TABLE_SCHEMA | ... |          EXTRA | ... |
-------------------------------------------------------------
|           def |   db_2_00314 | ... | auto_increment | ... |

对于MSSQL，see here。

Answer 3

运行：describe'table_name';在EXTRA栏中您正在寻找

Answer 4

这适用于sql server： select COLUMN_NAME, TABLE_NAME from INFORMATION_SCHEMA.COLUMNS where TABLE_SCHEMA = 'dbo' and COLUMNPROPERTY(object_id(TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1 order by TABLE_NAME

SQL - 检查列是否自动递增

4 个答案: