Question

我正在写一个查询来获取数据，该查询基于VENDOR_ID列中具有最小值的ITM_VNDR_PRIORITY项。 ITM_VNDR_PRIORITY来自另一个共享密钥VENDOR_ID的表。

查询，我正在使用该查询来获取与某个项目相关联的供应商：

SELECT * 
FROM PS_ITM_VENDOR
WHERE INV_ITEM_ID = '1003'

结果：

 SETID  INV_ITEM_ID   VENDOR_SETID   VENDOR_ID  ITMV_PRIORITY_LOC  ITM_ID_VNDR   ITM_VNDR_PRIORITY
 SHARE  1003          SHARE          84764A     000001             CFG246        3      
 SHARE  1003          SHARE          CAMLAB     000001             CAT895        4
 SHARE  1003          SHARE          GYRENT     000001             TDOC-7FS      2
 SHARE  1003          SHARE          RLMED      000001             CAT895        1

我想为此ITM_VNDR_PRIORITY（在本例中为VENDOR_ID“ RLMED”）中的SELECT * FROM PS_ITM_VNDR_UOM UPDEV WHERE INV_ITEM_ID = '1003'最低的商品ID选择供应商，并且仅将该供应商的行返回到此查询中我当前返回的位置与该项目关联的所有供应商：

SETID   INV_ITEM_ID  VENDOR_SETID  VENDOR_ID   VNDR_LOC
--------------------------------------------------------
SHARE   1003         SHARE         GYRENT      000001
SHARE   1003         SHARE         RLMED       000001
SHARE   1003         SHARE         84764A      000001
SHARE   1003         SHARE         CAMLAB      000001
SHARE   1003         SHARE         GYRENT      000001
SHARE   1003         SHARE         RLMED       000001

结果：

SELECT *
FROM PS_ITM_VNDR_UOM UPDEV
LEFT OUTER JOIN PS_ITM_VENDOR UPDEC ON UPDEV.SETID = UPDEC.SETID 
                                    AND UPDEV.INV_ITEM_ID = UPDEC.INV_ITEM_ID 
                                    AND UPDEV.VENDOR_SETID = UPDEC.VENDOR_SETID 
                                    AND UPDEV.VENDOR_ID = UPDEC.VENDOR_ID 
WHERE UPDEV.INV_ITEM_ID = '1003'

我希望此查询仅基于（MIN）优先级最低的供应商返回与供应商“ RLMED”相关联的商品。到目前为止，这是我写的内容，因为我不确定如何仅获取与该项目关联的最小ITM_VNDR_PRIORITY的供应商ID。

SETID   INV_ITEM_ID  VENDOR_SETID  VENDOR_ID   VNDR_LOC
--------------------------------------------------------
SHARE   1003         SHARE         RLMED       000001
SHARE   1003         SHARE         RLMED       000001

在此示例中，期望的结果如下（返回具有最低（MIN）优先级的供应商“ RLMED”）：

SELECT *
FROM PS_ITM_VNDR_UOM UPDEV
LEFT OUTER JOIN PS_ITM_VENDOR UPDEC ON UPDEV.SETID = UPDEC.SETID 
AND UPDEV.INV_ITEM_ID = UPDEC.INV_ITEM_ID AND UPDEV.VENDOR_SETID = UPDEC.VENDOR_SETID AND UPDEV.VENDOR_ID = UPDEC.VENDOR_ID 
WHERE UPDEV.INV_ITEM_ID = '1003'
 AND EXISTS (SELECT MIN(ITM_VNDR_PRIORITY)
             FROM PS_ITM_VENDOR UPDEC
             WHERE UPDEC.INV_ITEM_ID = UPDEV.INV_ITEM_ID
             AND UPDEC.VENDOR_ID = UPDEC.VENDOR_ID)

编辑：

我尝试使用此查询，但它仍返回所有供应商，而不是优先级最低的供应商

{{1}}

Answer 1

我建议使用相关子查询：

SELECT UPDEV.*
FROM PS_ITM_VNDR_UOM UPDEV LEFT OUTER JOIN
     PS_ITM_VENDOR UPDEC
     ON UPDEV.SETID = UPDEC.SETID AND
        UPDEV.INV_ITEM_ID = UPDEC.INV_ITEM_ID AND 
        UPDEV.VENDOR_SETID = UPDEC.VENDOR_SETID AND
        UPDEV.VENDOR_ID = UPDEC.VENDOR_ID 
WHERE UPDEV.INV_ITEM_ID = 1003 AND
      UPDEC.ITM_VNDR_PRIORITY = (SELECT MIN(UPDEC2.ITM_VNDR_PRIORITY)
                                 FROM PS_ITM_VENDOR UPDEC2
                                 WHERE UPDEC2.SETID = UPDEC.SETID AND
                                      UPDEC2.INV_ITEM_ID = UPDEC.INV_ITEM_ID AND 
                                       UPDEC2.VENDOR_SETID = UPDEC.VENDOR_SETID AND
                                       UPDEC2.VENDOR_ID = UPDEC.VENDOR_ID 
                                );

尤其是在PS_ITM_VNDR_UOM(INV_ITEM_ID, ITM_VNDR_PRIORITY)上有索引的情况下，这应该非常快。

根据另一个表中其他列的值选择供应商ID

1 个答案: