Question

我需要生成TSQL这样的查询：

IF @GenderOfEmployee IS NOT NULL
    CASE @GenderOfEmployee = 1
        THEN INSERT INTO @NotAllowedGenderOfJobPost (TagID) values (139)
        ELSE INSERT INTO @NotAllowedGenderOfJobPost (TagID) values (138)
    END;

我的意思是我希望CASE声明中有IF声明可能吗？
考虑到我不想要其他类似的方式来提供该查询。
感谢您的高级帮助。

Answer 1

像这样改变

IF @GenderOfEmployee IS NOT NULL
BEGIN
     INSERT INTO @NotAllowedGenderOfJobPost (TagID) SELECT CASE WHEN @GenderOfEmployee = 1
        THEN 139
        ELSE 138
    END
END;

Answer 2

select无需插入case表达式的结果：

declare @NotAllowedGenderOfJobPost as Table ( TagId Int );
declare @GenderOfEmployee as Int = NULL;

-- Try NULL.
if @GenderOfEmployee is not NULL
  insert into @NotAllowedGenderOfJobPost (TagId ) values
    ( case when @GenderOfEmployee = 1 then 139 else 138 end );
select * from @NotAllowedGenderOfJobPost;

-- Try 0.
set @GenderOfEmployee = 0;
if @GenderOfEmployee is not NULL
  insert into @NotAllowedGenderOfJobPost (TagId ) values
    ( case when @GenderOfEmployee = 1 then 139 else 138 end );
select * from @NotAllowedGenderOfJobPost;

-- Try 1.
set @GenderOfEmployee = 1;
if @GenderOfEmployee is not NULL
  insert into @NotAllowedGenderOfJobPost (TagId ) values
    ( case when @GenderOfEmployee = 1 then 139 else 138 end );
select * from @NotAllowedGenderOfJobPost;

如何在IF语句中使用嵌套CASE编写TSQL查询

2 个答案: