Question

我有一张桌子，如下表

id      ParentName    HandleName       CreatedDate       
===================================================
139       MI          MI-Chart-QL       2018-02-20       
139       MI          MI-chart-act      2018-02-20       
139       MI          MI-chart-act      2018-02-20       
139       CRA         CRA-chart-act     2018-02-20
139       CRA         CRA-Chart-act     2018-02-20

我想添加一个包含值的列-有意或无意如果具有 Act 的HandleName具有与具有 QL 的ID，CreatedDate和ParentName的HandleName相同的ID，即CreatedDate和ParentName，则是有意的。我要寻找的决赛桌是

id      ParentName    HandleName       CreatedDate    Intentionally/unintentionally   
====================================================================================
139       MI          MI-Chart-QL       2018-02-20       Intentionally
139       MI          MI-chart-act      2018-02-20       Intentionally
139       MI          MI-chart-act      2018-02-20       Intentionally
139       CRA         CRA-chart-act     2018-02-20       Unintentionally   
139       CRA         CRA-Chart-act     2018-02-20       Unintentionally

带有'CRA-chart-act'的HandleName是无意的，因为ParentName与'MI-Chart-QL'不匹配

我使用下面的代码（如果Row_Number（）> 2我可以有意地标记它们），但是我如何检查它们的父名称是否相同以有意或无意地标记它们呢？

Row_Number() over (Partition by id, CreatedDate ORDER BY createdDate asc)

Answer 1

您可以使用窗口功能：

select t.*,
    case when max(case when handlename like '%-QL%' then 1 else 0 end)
                  over(partition by id, parentname, createddate) = 1
        then 'Intentionally'
        else 'Unintentionally'
    end as status
from mytable t

Answer 2

这是另一种方式：

SELECT
    t1.*
    , CASE
          WHEN t2.Intentionally = 1 THEN 'Intentionally'
          ELSE 'Unintentionally'
      END AS 'Intentionally/unintentionally'
FROM
    mytable t1
    OUTER APPLY
    (
        SELECT TOP 1
            1 AS 'Intentionally'
        FROM
            mytable t2
        WHERE
            t1.parentName = t2.parentname
            AND t1.CreatedDate = t2.CreatedDate
            AND t2.HandleName LIKE '%QL'
    )       t2;

将同一列中的值与SQL Server中的其他列进行比较

2 个答案: