Question

我尝试了几个sql脚本，但是失败了。这是我最接近的一个：

SELECT *
FROM INFORMATION_SCHEMA.STATISTICS
WHERE table_schema = schema()
AND   table_name   = 'my_table_name'
AND   index_name   = 'column_name';

Answer 1

我认为您需要以下声明

https://www.db-fiddle.com/f/jbdzXwpWkYichsBL1ib2Rj/2

VBA

或以下 https://www.db-fiddle.com/f/jbdzXwpWkYichsBL1ib2Rj/3

   select constraint_name
from information_schema.table_constraints
where table_name = 'mytable'
and table_schema = 'myschema'
and constraint_name = 'PRIMARY'
    and constraint_name = 'PRIMARY'

Answer 2

SELECT * FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_schema = schema()
AND column_key = 'PRI'
AND table_name = 'my_table_name'
AND column_name = 'column_name';

如何检查MySQL中是否存在主键

2 个答案: