如何使用INFORMATION_SCHEMA查找2個表之間的公共字段？

Question

例如，如果我需要加入表A &表B - 如何使用INFORMATION_SCHEMA數據庫來查找它們之間的公共字段？

Answer 1

這裏有一個方法：

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，還應該包括table_schema識別表。

Answer 2

另一種方式來獲得公共字段兩個表：

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

方式有兩種表獲得公共列：

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'