Question

以下查询正常工作，并根据需要返回正确的结果

select top 1 SID from vSTable where (ID in 
(select ID from Engine where Name='nnn' OR Name='mmm') 
and QuestionTypeID=1 and IsOfficial=1) order by vSTable.ITime desc;

但是当我像这样使用它时

declare @SVal as int

set @SVal = select top 1 SID 
            from vSTable 
            where (
              ID in 
                  (select ID from Engine where Name='nnn' OR Name='mmm') 
              and QuestionTypeID=1 
              and IsOfficial=1
            ) order by vSTable.ITime desc;

我在select stmt

附近得到错误的错误语法

Answer 1

将select语句包装在括号中

declare @SVal as int

set @SVal = (select top 1 SID 
            from vSTable 
            where (
              ID in 
                  (select ID from Engine where Name='nnn' OR Name='mmm') 
              and QuestionTypeID=1 
              and IsOfficial=1
            ) order by vSTable.ITime desc);

Answer 2

你的语法有点偏。这应该有效：

  select @SVal = (select top 1 SID from vSTable where (ID in 
  (select ID from Engine where Name='nnn' OR Name='mmm') 
  and QuestionTypeID=1 and IsOfficial=1) order by vSTable.ITime desc)

请注意，您可以使用SET或SELECT进行该分配。

基本SQL顺序按查询

2 个答案: