sql 错误 1241 操作数应包含 1 列

Question

这是我的查询

select * 
from players 
where sport='football' 
  and position='DEF' 
  and pname!='Binoy Dalal' 
  and pname not in (select player1,player2,player3,player4,player5,player6,player7,player8
                    from team 
                    where sap='60003100009') 
order by price desc;

没有该pname not in ...条款它工作正常。

我无法弄清楚什么是错误的原因在语法上它是正确的，因为 mysql 没有显示任何错误。

Answer 1

您不能在这样的子查询中返回多个列，因此您有多种方法可以重写此查询以使其工作。

您可以取消透视team表中的数据，以便只返回一列：

select * 
from players 
where sport='football' 
  and position='DEF' 
  and pname!='Binoy Dalal' 
  and pname not in (select player1 
                    from team where sap='60003100009'
                    union all
                    select player2
                    from team where sap='60003100009'
                    union all
                    select player3
                    from team where sap='60003100009'
                    union all
                    select player4
                    from team where sap='60003100009'
                    union all
                    select player5
                    from team where sap='60003100009'
                    union all
                    select player6
                    from team where sap='60003100009'
                    union all
                    select player7
                    from team where sap='60003100009'
                    union all
                    select player8
                    from team where sap='60003100009') 
order by price desc;

或者您可以使用NOT EXISTS查询：

select * 
from players p
where sport='football' 
  and position='DEF' 
  and pname!='Binoy Dalal' 
  and not exists (select *
                  from team t
                  where sap='60003100009' 
                    AND
                    (
                      p.pname = t.player1 OR
                      p.pname = t.player2 OR
                      p.pname = t.player3 OR
                      p.pname = t.player4 OR
                      p.pname = t.player5 OR
                      p.pname = t.player6 OR
                      p.pname = t.player7 OR
                      p.pname = t.player8
                    ))
order by price desc;

或者您必须对WHERE播放器名称使用多个过滤器：

select * 
from players 
where sport='football' 
  and position='DEF' 
  and pname!='Binoy Dalal' 
  and pname not in (select player1 
                    from team where sap='60003100009')
  and pname not in (select player2 
                    from team where sap='60003100009')
  and pname not in (select player3 
                    from team where sap='60003100009')
  and pname not in (select player4 
                    from team where sap='60003100009')
  and pname not in (select player5 
                    from team where sap='60003100009')
  and pname not in (select player6 
                    from team where sap='60003100009')
  and pname not in (select player7 
                    from team where sap='60003100009')
  and pname not in (select player8 
                    from team where sap='60003100009')
order by price desc;

但是，理想情况下，您应该考虑对team表格进行规范化，以便有一列包含玩家姓名，另一列为他们分配玩家编号。与此类似：

create table team
(
  player varchar(50),
  playerNumber int
);

然后，当您搜索团队数据时，您只需加入一列而不是 8 个不同的列。