Question

我目前遇到SQL Server的问题，我无法弄清楚。

错误是：

为变量赋值的SELECT语句不能与数据检索操作结合使用

SQL：

DECLARE @IdUser INT 

Select 
    @IdUser = Id, 
    Username, 
    (Select Count(*) From GagsLikes where Userid = @IdUser And Good = 1) as GagLikes, 
    (Select Count(*) From GagsViews where UserID = @IdUser), 
    (Select Count(*) From Gags Where UserID = @IdUser) as GagViews 
From 
    Users  
Order by 
    GagLikes, GagViews

提前致谢！

Answer 1

您可能无法使用该变量，请尝试以下操作：

Select 
    U.Id, 
    U.Username, 
    (Select Count(*) From GagsLikes where Userid = U.Id And Good = 1) as GagLikes, 
    (Select Count(*) From GagsViews where UserID = U.Id), 
    (Select Count(*) From Gags Where UserID = U.Id) as GagViews 
From 
    Users AS U
Order by 
    GagLikes, GagViews

Answer 2

您的表可能会返回多行。确保您的表只返回一行，否则它可以 t将多个id存储到一个int变量中。

SQL Server：Declare导致查询出现问题

2 个答案: