SQL加入使用多个表where子句

Question

我想写一个SQL语句：

Select * FROM table1 
inner join table2 AS t2 
    ON 
inner join table3 AS t3 
    ON 
inner join table4 AS t4 
    ON 
Where FK_Client_ID = 4 

所有的表，客户端ID共同点。所以不知道在ON上该做什么。

它会像ON t2.FK_Client_ID = ......不确定。

所以我只想从这些具有FK_Client_ID的表中获取共同的数据。

Answer 1

Select *, 
    (Select FK_Client_ID from table2 where FK_Client_ID = t1.FK_Client_ID )As TID1, 
    (Select FK_Client_ID from table3 where FK_Client_ID = t1.FK_Client_ID )As TID2, 
    (Select FK_Client_ID from table4 where FK_Client_ID = t1.FK_Client_ID )As TID3 
FROM table1 t1 

Answer 2

试试这个

Select * FROM table1 t1 
inner join table2 AS t2 
    ON t2.FK_Client_ID = t1.FK_Client_ID 
inner join table3 AS t3 
    ON t3.FK_Client_ID = t1.FK_Client_ID 
inner join table4 AS t4 
    ON t4.FK_Client_ID = t1.FK_Client_ID 
Where t1.FK_Client_ID = 4 

Answer 3

如果你的洋场的名字是"FK_Client_ID"和table1的主键是"Client_ID"

Select * FROM table1 
inner join table2 AS t2 
    ON t2.FK_Client_ID = table1.Client_ID 
inner join table3 AS t3 
    ON t3.FK_Client_ID = table1.Client_ID 
inner join table4 AS t4 
    ON t4.FK_Client_ID = table1.Client_ID 
Where table1.Client_ID = 4 

由于您使用的内部连接，无论你用table1或其他任何加入他们他们的

Answer 4

Select * FROM table1 t1 inner join table2 t2 
    ON t1.FK_Client_ID = t2.FK_Client_ID 
     inner join table3 t3 
    ON t1.FK_Client_ID = t3.FK_Client_ID 
     inner join table4 t4 
    ON t1.FK_Client_ID = t4.FK_Client_ID 
Where t1.FK_Client_ID = 4