Question

除了使用游标之外，还有什么方法可以将SELECT结果用于后续的INSERT/UPDATE查询吗？

类似的东西：

DECLARE @SELECTRESULT;

SELECT Something into @SELECTRESULT
FROM Somewhere

INSERT INTO SomewhereElse (X, XX, XXX)
SELECT Something, GETDATE(), 'XXX'
FROM @SELECTRESULT

UPDATE Somewhere
Set SomethingElse = 'ABC'
WHERE
Something in
(SELECT Something FROM @SELECTRESULT)

原因是我有来自多个表的相对复杂的查询，我不希望重复此代码，一次用于插入，第二次用于更新。

Answer 1

您可以使用表变量。

像

这样的东西

DECLARE @Table TABLE(
Col1 INT
)

INSERT INTO @Table
SELECT Col1
FROM Table

看看

Table Variables In T-SQL

DECLARE @local_variable (Transact-SQL)

Answer 2

只需使用临时表就可以了：

将某些内容添加到#temporary_table FROM Somewhere WHERE blabla

Answer 3

使用临时表。

CREATE TABLE #tempTable
(
Something int NOT NULL,
CurrentDate DateTime NULL,
    XXX Varchar(50)
)

然后在多个表上使用复杂查询并将结果集插入tempTable。

Insert into #tempTable
-- Complex Select Query

确保所选查询返回的列按照#tempTable结构的顺序匹配。列数也应该匹配。一旦你拥有了复杂数据的#tempTable，就可以多次使用它来进行插入和更新查询。

INSERT INTO SomewhereElse (X, XX, XXX)
SELECT * from #tempTable

UPDATE Somewhere
Set SomethingElse = 'ABC'
WHERE
Something in (SELECT Something FROM #tempTable)

Answer 4

DECLARE @SELECTRESULT table(Something nvarchar(50)) --the data that you could reuse.
insert into @SELECTRESULT(Something)
SELECT Something
FROM Somewhere

INSERT INTO SomewhereElse (X, XX, XXX)
SELECT Something, GETDATE(), 'XXX'
FROM @SELECTRESULT

UPDATE Somewhere
Set SomethingElse = 'ABC'
WHERE Something in
(SELECT Something FROM @SELECTRESULT)

将SELECT结果用于其他查询

4 个答案: