Question

我必须运行多个相互依赖的查询

select a from a ( result has multiple rows)
select b from b  ( result has multiple rows)

对于该查询中的每一行，我需要运行此

select c from c where c.a=a amd c.b=b

 insert  c into d

有点像：

select a from a ( result has multiple rows)
select b from b  ( result has multiple rows 
  for a in a
      for b in b
          select c from c where c.a=a amd c.b=b
          insert  c,a,b into d

这可以作为存储过程吗？

谢谢

Answer 1

存储过程？当然。拍摄，甚至可以在一个声明中说明：

INSERT INTO d (c)
  SELECT c FROM c WHERE c.a IN (SELECT a FROM a) AND c.b IN (SELECT b FROM b)

你甚至可以通过连接做得更好，但写一下我需要更多地了解这些表的关系。

Answer 2

我很确定你可以在不使用SQL中的任何循环的情况下编写此查询。

Answer 3

INSERT
INTO    d
SELECT  c.*
FROM    a
CROSS JOIN
        b
JOIN    с
ON      c.a = a.id
        AND c.b = b.id

SQL Server问题存储过程循环

3 个答案: