Question

我有一个表格，我希望过滤所有行代码，生命和TC等于同一查询的结果，这些行是按ID过滤的

ID  Code|Life|TC|PORT
62  XX101   1   1   1
63  XX101   1   1   2
64  AB123   1   1   1
65  AB123   1   1   2
66  AB123   1   1   3
67  CD321   1   1   1
68  CD321   1   1   2

这是我提出的最好的，但它看起来效率不高。

select ID from #table
where Code = (Select Code from #table where ID = @Port1) and 
      Life = (Select Life from #table where ID = @Port1) and 
      TC = (Select TC from #table where ID = @Port1)

Answer 1

以下是您需要的查询：

select t2.* 
from #table t1
join #table t2 on t1.Code = t2.Code and 
                  t1.Life = t2.Life and 
                  t1.TC = t2.TC and 
                  t1.PORT = t2.PORT
where t1.id = @Port1

使用cross apply：

select ca.* 
from #table t1
cross apply (select * from #table t2 where t1.Code = t2.Code and 
                                           t1.Life = t2.Life and 
                                           t1.TC = t2.TC and 
                                           t1.PORT = t2.PORT) ca
where where t1.id = @Port1

使用cte：

with cte as(select * from #table where id = @Port1)
select t.* 
from #table t
join cte c on t.Code = c.Code and 
              t.Life = c.Life and 
              t.TC = c.TC and 
              t.PORT = c.PORT

Answer 2

您可以为此方案使用EXIST语句

{{1}}

Answer 3

您的代码看起来提供了与

相同的结果

SELECT ID 
FROM #table AS tbl1
 INNER JOIM#table AS tbl2 on
   tbl2.ID =@Port1 AND 
   tbl1.Life =tbl2.Life AND 
   tbl1.TC =tbl2.TC

但它更贵您总是要求在where子句下的选择中使用相同的记录。然后每次你选择一个不同的字段来匹配。但请注意，因为如果有多个带有该ID的记录，则查询会产生错误，因为您使用了=运算符，它只需要检查的字段的一个实例。

Answer 4

使用窗口函数：

;WITH CTE AS (
  SELECT *, RANK() OVER (ORDER BY [Code], [Life], [TC]) AS grp
  FROM mytable 
), CTE2 AS (SELECT grp FROM CTE WHERE ID = @Port1)
SELECT *
FROM CTE
WHERE grp = (SELECT grp FROM CTE2)

上面的查询找到[Code], [Life], [TC]所属的ID = @Port1分区，然后选择该分区的所有行。

SQL：通过3列选择结果

4 个答案: