sql select 来自 except 结果的列

Question

我尝试从 except result 中获取列，但总是出现错误 "Incorect syntax near ')'"，即使我将 Select * 放在第一个 select 中也是如此。我在 SQL Management Studio 工作。我的代码看起来像

select ColumnResult from (
            select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
            from SourceTable 
            except
            select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
            from SourceTable2)

Answer 1

你需要给子查询一个别名：

select ColumnResult from (
            select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
            from SourceTable 
            except
            select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
            from SourceTable2) AS Src

Answer 2

你会出错，因为每个 table 都有自己的别名，所以这样做

select A.ColumnResult from (
                select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
                from SourceTable 
                except
                select col1 as ColumnResult, col2 as Column2Result, col3 as Column3Result
                from SourceTable2) as A

sql select 来自 except 结果的列

sql select column from except result

sql

sql-server

except