tsql - 使用左连接和表变量删除

Question

也许我缺少一个括号或其他东西，但我很难从我要加入的表变量中删除行并寻找我要加入的键。如果它有价值，那么我就摆脱它。问题是我无法解析查询。有任何想法吗？

declare @MrTemp 
(
    key1 int
   ,key2 int
)

insert into @MrTemp
select key1, key2 from ASourceTable

delete  
from @MrTemp mt
left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 
where art.key1 is not null and art.key2 is not null

Answer 1

DELETE @MrTemp
FROM @MrTemp mt LEFT JOIN ...

Answer 2

您需要在删除之后但在要从中删除的表的 from 之前引用别名

delete art 
from @MrTemp mt left join ARealTable art on 
mt.key1 = art.key1 and mt.key2 = art.key2 
where art.key1 is not null and art.key2 is not null

Answer 3

您一次只能从一个表中删除：

从@MrTemp 中删除[ARealTable 中有匹配记录]

delete mt
from @MrTemp mt left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 where art.key1 is not null and art.key2 is not nu

二

或者。从 ARealTable 中删除 [再次在 ARealTable 中有相应记录的记录]

delete art
from @MrTemp mt left join ARealTable art on mt.key1 = art.key1 and mt.key2 = art.key2 where art.key1 is not null and art.key2 is not null