Question

我需要一些创建更新查询的帮助。例如，我有

select:(T1- table 1, T2- tables 2, Z1 -column from table 1, Z2 Column from table 2 etc)

Select * from T1,T2 where X1=X2 and Y1=Y2 and Z1=Z2 and Datea>=20160601 and Dateb<20160720 and B1=2 and C1=5 and D1=10 and E2 in (A+,A-, 22,33,44)

现在我想写一个使用参数<{p>的update

from where
update T1 set F1, G1 where

如何写出正确的条件？

Answer 1

update T1 set F1=10, G1=50 
where exist (Select F1, G1 
             from T1,T2 where X1=X2 
             and Y1=Y2 and Z1=Z2 
             and Datea>=20160601 
             and Dateb<20160720 
             and B1=2 
             and C1=5 
             and D1=10 
             and E2 in (A+,A-, 22,33,44))

Youi必须选择需要在select子句中更新的列。

还要先尝试运行select语句，看看你是否得到了想要的结果

来自2个表的SQL更新1表

1 个答案: