Question

我有一张ITEM , OPCODE ,WorkCenter, LOT , COIL ,Strt_Time(DateTime)的表。我想返回Previous WorkCenter和NextWorkCenter以及ITEM , OPCODE ,WorkCenter, LOT , COIL ,Strt_Time。

一个特殊的LOT线圈将从工作中心路由到工作中心，并带有时间戳（Strt_time）

请在SQL Server 2008中建议如何实现这一目标。

提前致谢。

Answer 1

在SQL Server 2012中，您应该使用LEAD和LAG函数。

由于您使用的是SQL Server 2008，因此这是一种解决方法：

WITH WorkCenter_details AS
(
    SELECT
        ROW_NUMBER() OVER (  ORDER BY Strt_Time) rn,
        (ROW_NUMBER() OVER (  ORDER BY Strt_Time)) / 2 rndiv2,
        (ROW_NUMBER() OVER (  ORDER BY Strt_Time) + 1) / 2 rnplus1div2,
        ITEM, OPCODE, WorkCenter, LOT, COIL, Strt_Time
    FROM 
        MyTable
)
SELECT
    rn, rndiv2, rnplus1div2,
    ITEM, OPCODE, WorkCenter, LOT, COIL, Strt_Time,
    CASE 
       WHEN rn % 2 = 1 
          THEN MAX(CASE WHEN rn % 2 = 0 THEN WorkCenter END) OVER (PARTITION BY  rndiv2) 
          ELSE MAX(CASE WHEN rn % 2 = 1 THEN WorkCenter END) OVER (PARTITION BY rnplus1div2)
    END AS WorkCenter_Previous,
    CASE 
       WHEN rn % 2 = 1 
          THEN MAX(CASE WHEN rn % 2 = 0 THEN WorkCenter END) OVER (PARTITION BY rnplus1div2) 
          ELSE MAX(CASE WHEN rn % 2 = 1 THEN WorkCenter END) OVER (PARTITION BY rndiv2)
    END AS WorkCenter_Next
FROM 
    WorkCenter_details
ORDER BY 
    ITEM, Strt_Time

仅当工作中心为数字

时才有效

如何在SQL Server中基于子查询返回值？

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