Question

我在函数中有这个结构：

INSERT INTO @TheTable
    SELECT DISTINCT

        @Number AS Number,

        @Name AS Name

    FROM MYTABLE 
    WHERE id = @id

我需要在这个结构中添加执行另一个函数的结果，我需要你的帮助才能这样做。

在@Name AS Name下面，我应该添加类似这样的内容

IF (dbo.anotherFunction(@id)==1) 
@NewVisitor AS NewVisitor
ELSE
@NewVisitor AS NoNewVisitor

如何将其转换为TSQL？

万分感谢！

Answer 1

猜猜这就是你想要的......

INSERT INTO @TheTable
    SELECT DISTINCT
        @Number AS Number,
        @Name AS Name,
        case when (dbo.anotherFunction(@id)=1) then @NewVisitor else null end as NewVisitor,
        case when (dbo.anotherFunction(@id)<>1) then @NewVisitor else null end AS NoNewVisitor
    FROM MYTABLE 
    WHERE id = @id

Answer 2

SELECT语句中没有IF语句。相反，你会想要使用CASE。

MSDN Documentation on CASE

Answer 3

这个问题对我来说没什么意义（为什么所有变量，列是什么意思？），但你可以这样做：

IF (dbo.anotherFunction(@id)==1) 
    INSERT INTO @TheTable
    SELECT DISTINCT
        @Number AS Number,
        @Name AS Name,
        @NewVisitor AS NewVisitor
    FROM MYTABLE 
    WHERE id = @id
ELSE
    INSERT INTO @TheTable
    SELECT DISTINCT
        @Number AS Number,
        @Name AS Name,
        @NewVisitor AS NoNewVisitor
    FROM MYTABLE 
    WHERE id = @id

或者使用两个CASE语句来选择NewVisitor和NoNewVisitor。

TSQL：if语句中的select语句

3 个答案: