Question

例如，如果我需要加入TableA＆amp;表B - 如何使用INFORMATION_SCHEMA数据库查找它们之间的公共字段？

Answer 1

这是一种方法：

select column_name
from information_schema.columns c
where table_name in ('A', 'B')
group by column_name
having count(*) = 2;

如有必要，还应包括table_schema以识别表格。

Answer 2

在两个表中获取公共字段的另一种方法：

SELECT  C.name
FROM    SYS.OBJECTS O
JOIN    SYS.COLUMNS C
ON      O.object_id = C.object_id
WHERE   O.name IN
(
'TABLE-A', 'TABLE-B'
)
group by C.name
having count(*) = 2;

Answer 3

获取两个表中的公共列的方法：

SELECT  A.COLUMN_NAME 
FROM INFORMATION_SCHEMA.COLUMNS A 
JOIN INFORMATION_SCHEMA.COLUMNS B ON A.COLUMN_NAME = B.COLUMN_NAME
WHERE A.TABLE_NAME 'Table_1' 
AND B.TABLE_NAME = 'Table_2'

如何使用INFORMATION_SCHEMA查找2个表之间的公共字段？

3 个答案: