查询以获取库存的输出

Question

我需要通过查询输出，如下面给出的点

1. 有库存表包含多个salemrp的所有商品
2. 我需要那些库存在多个salemrp中的记录，但如果一个商品只有一个salemrp，我也需要这些记录。

我的查询如下，请帮助我，如何操纵此查询。

SELECT
    itemid,
    grpid,
    (SELECT
        itemname
        FROM sap_itemmASter
        WHERE itemid=sap_stockmASter.itemid )AS itemname, 
    (SELECT grpname
        FROM sap_grpmASter
        WHERE grpid=sap_stockmASter.grpid) AS grpname,
    (SELECT partno
        FROM sap_itemmASter
        WHERE itemid=sap_stockmASter.itemid) AS partno,
    salemrp,
    (SELECT brANDname
        FROM sap_brANDmASter
        WHERE brANDid IN (SELECT brANDid
                            FROM sap_itemmASter
                            WHERE itemid=sap_stockmASter.itemid)) AS catname,
    (laneno + ' - ' + rackno) AS locno,
    isnull(SUM(stkqty),0) AS balqty,
    (SELECT top 1 (laneno + ' - ' + rackno)
        FROM sap_stockloc
        WHERE itemid=sap_stockmASter.itemid) AS storeloc
FROM sap_stockmASter
WHERE laneno!=''
AND itemid>0 
AND grpid IN (SELECT grpid
                FROM sap_grpmASter
                WHERE isactive=1
                AND isdel=1)
AND itemid IN (SELECT itemid 
                FROM sap_itemmASter
                WHERE isdel=1
                AND isactive=1
                AND laneno=sap_stockmASter.laneno
                AND rackno=sap_stockmASter.rackno) 
AND grpid=37
GROUP BY itemid,grpid,laneno,rackno,salemrp
ORDER BY itemname

更多信息：

Item Name   SaleMrp Qty 
ABC         158.00  48  
ABC         165.00  -11 
ABC         170.00  5   

在此我想不显示负片，但

XYZ         125.00 0 

（我也需要这个记录，因为它只有一个mrp）

PQR         100.00  -5 

（我也需要这个记录，因为它只有一个mrp）