Question

我对CTEs，temp表格进行了一次非常大的查询，并且我希望将其放入IF和ELSE块中，因为它们具有不同的条件对于他们两个，取决于参数。简化后如下所示：

DECLARE @parameter varchar(15)

If(OBJECT_ID('tempdb..#table1') Is Not Null)
Begin
    Drop Table #table1
End
create table #table1
(
column1
column2
column3
)

If(OBJECT_ID('tempdb..#table2') Is Not Null)
Begin
    Drop Table #table2
End
create table #table2
(
column1
column2
column3
)

IF @parameter = 'Option1' BEGIN
select * from (

INSERT INTO #table1
select * from... where 'condition_for_Option1'
INSERT INTO #table2
select * from... where 'condition_for_Option1'

select * from #table1
union all
select * from #table2) as DATA
  END ELSE

IF @parameter = 'Option2' BEGIN
SELECT *
FROM
(
INSERT INTO #table1
select * from... where 'condition_for_Option2'
INSERT INTO #table2
select * from... where 'condition_for_Option2'

select * from #table1
union all
select * from #table2)
as DATA
  END

我把#temp表放在开头，它修复了一部分问题，但我仍然有：

Msg 156，Level 15，State 1，Line 31
  关键字＆＃39; INSERT＆＃39;附近的语法不正确   Msg 102，Level 15，State 1，Line 37
  ＆＃39;）＆＃39;附近的语法不正确   Msg 156，Level 15，State 1，Line 48
  关键字＆＃39; INSERT＆＃39;附近的语法不正确   Msg 102，Level 15，State 1，Line 54
  ＆＃39;）附近的语法不正确＆＃39;。

这是如何使这项工作的？

Answer 1

insert声明中不能包含select声明。 Actualy你可以改写：

IF @parameter = 'Option1' 
BEGIN

    INSERT INTO #table1
    SELECT * FROM... WHERE 'condition_for_Option1'
    INSERT INTO #table2
    SELECT * FROM... WHERE 'condition_for_Option1'

    SELECT * FROM #table1
    UNION ALL
    SELECT * FROM #table2

END 

ELSE IF @parameter = 'Option2' 
BEGIN

    INSERT INTO #table1
    SELECT * FROM... WHERE 'condition_for_Option2'
    INSERT INTO #table2
    SELECT * FROM... WHERE 'condition_for_Option2'

    SELECT * FROM #table1
    UNION ALL
    SELECT * FROM #table2

END

但我在这里看不到临时表的任何用法，所以你可以重写：

IF @parameter = 'Option1' 
BEGIN

    SELECT * FROM... WHERE 'condition_for_Option1'
    UNION ALL
    SELECT * FROM... WHERE 'condition_for_Option1'

END 

ELSE IF @parameter = 'Option2' 
BEGIN

    SELECT * FROM... WHERE 'condition_for_Option2'
    UNION ALL
    SELECT * FROM... WHERE 'condition_for_Option2'

END

Answer 2

为什么不呢？

IF @parameter = 'Option1' BEGIN

INSERT INTO #table1
select * from... where 'condition_for_Option1'
INSERT INTO #table2
select * from... where 'condition_for_Option1'

select * from (

select * from #table1
union all
select * from #table2) as DATA
END 
ELSE

IF @parameter = 'Option2' BEGIN

INSERT INTO #table1
select * from... where 'condition_for_Option2'
INSERT INTO #table2
select * from... where 'condition_for_Option2'
SELECT *
FROM
(
select * from #table1
union all
select * from #table2)
as DATA
END

SQL IF和ELSE块内部有临时表

2 个答案: