Question

概要;某些列加入一些表有类似的结果。我们如何对它们进行分组并选择max（column）。

我的查询是;

SELECT DISTINCT TOP (1000) LG_070_ITEMS.CODE AS PRODCODE,
                LG_070_01_SERILOTN.CODE AS CODE,
                LG_070_01_SLTRANS.OUTCOST,
                LG_070_01_SLTRANS.LOGICALREF AS LREF,
                LG_070_01_SLTRANS.INSLTRANSREF,
                LG_070_01_SLTRANS.INVENNO,
                LG_070_01_SLTRANS.INTRANSREF,
                LG_070_01_SLTRANS.STTRANSREF
FROM LG_070_01_SERILOTN
INNER JOIN LG_070_01_SLTRANS ON LG_070_01_SLTRANS.SLREF = LG_070_01_SERILOTN.LOGICALREF
INNER JOIN LG_070_ITEMS ON LG_070_ITEMS.LOGICALREF = LG_070_01_SERILOTN.ITEMREF
WHERE [TIGERDB].[dbo].[LG_070_01_SERILOTN].CODE = '868328002749220'

并且数据库的答案也是;

产品代码--------------- COST - LREF ------一个twho三四

K-3773 868328002749220 50,85 46255 ------- 0 10 0 33584

K-3773 868328002749220 50,85 46504 ------- 46255 10 33584 33639

K-3773 868328002749220 50,85 46524 ------- 46504 11 33639 33640

K-3773 868328002749220 50,85 51273 ------- 46524 11 33640 38581

K-3773 868328002749220 50,85 51285 ------- 51273 9 38581 38587

K-3773 868328002749220 50,85 52275 ------- 51273 11 38581 39823

K-3773 868328002749220 50,85 52276 ------- 52275 9 39823 39824

现在我的问题是，如何选择最后一行。它可以更大的LREF列或第一列。

我的查询是一样的。我使用数字，其中stuation和结果与此相同。

我尝试使用max（columname）和group by othercolumns等。我使用查询设计器和microsoft sql server管理工具。

在那三个表中，未选中的列对我来说并不重要。使用mysql我可以使用select ... max（lref）从...加入...按代码分组，但我必须这样做MSSQL。

Answer 1

查询（可能会很贵）：

SELECT DISTINCT TOP (1000) t3.CODE AS PRODCODE,
                t.CODE AS CODE,
                t2.OUTCOST,
                t2.LOGICALREF AS LREF,
                t2.INSLTRANSREF,
                t2.INVENNO,
                t2.INTRANSREF,
                t2.STTRANSREF
FROM LG_070_01_SERILOTN t
INNER JOIN LG_070_01_SLTRANS t2 ON t2.SLREF = t.LOGICALREF
INNER JOIN LG_070_ITEMS t3 ON t3.LOGICALREF = t.ITEMREF
WHERE t.CODE = '868328002749220'
AND t2.LOGICALREF = (SELECT MAX(tt2.LOGICALREF)
                         FROM LG_070_01_SERILOTN tt
                         INNER JOIN LG_070_01_SLTRANS tt2 
                          ON tt2.SLREF = tt.LOGICALREF
                         INNER JOIN LG_070_ITEMS tt3 
                          ON tt3.LOGICALREF = tt.ITEMREF
                          WHERE tt.CODE = t.CODE)

示例查询 SQLFIDDLEExample ：

SELECT DISTINCT TOP (1000) t.*
FROM Table1 t
WHERE t.LREF = (SELECT MAX(tt.LREF)
                FROM Table1 tt
                WHERE tt.CODE = t.CODE)

结果：

| PRODCODE |            CODE |  COST |  LREF |   ONE | TWHO | THREE |  FOUR |
-----------------------------------------------------------------------------
|   K-3773 | 868328002749220 | 50,85 | 52276 | 52275 |    9 | 39823 | 39824 |

加入和分组结果

1 个答案: