SQL從兩個表中獲取公共行

Question

我有兩個表T1和T2。

任何人都可以幫助一個SQL查詢，它將從這兩個表中獲取通用行嗎？ （假設T1和T2各有100列）

P.S：我猜INNER JOIN在每一列上都不是一個好主意。

感謝

Answer 1

select 
    t1.* 
from 
    t1, t2 
where 
(
    (t1.col1 is null and t2.col1 is null) or (
    (t1.col1   = t2.col1  ) 
) and 
(
    (t1.col2 is null and t2.col2 is null) or (
    (t1.col2   = t2.col2  ) 
) and 
(
    (t1.col3 is null and t2.col3 is null) or (
    (t1.col3   = t2.col3  ) 
) and 
.... 
(
    (t1.col100 is null and t2.col100 is null) or (
    (t1.col100   = t2.col100  ) 
) 

Answer 2

使用INTERSECT

SELECT * FROM T1 
INTERSECT 
SELECT * FROM T2 

Answer 3

如果您在使用SQL Server 2005，那麼你可以使用相交關鍵詞，它給你共同記錄。

SELECT column1 
FROM table1 
INTERSECT 
SELECT column1 
FROM table2 

如果您希望在輸出中同時來自兩個表中具有公共列1的表1的column1和column2。

SELECT column1, column2 
FROM table1 
WHERE column1 IN 
(
SELECT column1 
FROM table1 
INTERSECT 
SELECT column1 
FROM table2 
)