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Question

我在主要详细信息布局中有两个表。 我希望仅在主表和明细记录满足条件的情况下才选择它们。 但是我希望所有主表项目都不管是否存在详细记录。

我的表格如下：主-库存物品

icmasterid  icdescription
WAD110795       WM KIWI-KLIP 3 BEND                    
WAD110796       WM KIWI-KLIP 3 BEND (MZ3,4,&6)                    
WAD118806-50    STROLLER VALENCE BACKDRP HINGE                    
WAD118808       IK STROL B DROP MOUNTING HDW    
WAD118942       1" S-HOOK BAG 100                                 

详细信息-库存线

icmasterid  icdetailquantity    pomasterid
WAD110796               -900    NULL
WAD110796                  0    NULL
WAD110796                  0    119450
WAD110796                900    119347
WAD118808                  0    NULL
WAD118808                 34    NULL
WAD118942                  0    NULL
WAD118942                 59    NULL
WAD118942                  0    NULL
WAD118942                -59    NULL
WAD118942                 59    NULL

我的SQL

SELECT inventoryitem.icmasterid,
       inventoryitem.icdescription,
       inventoryline.icdetailquantity,inventoryline.pomasterid
FROM  inventoryitem 
      LEFT OUTER JOIN inventoryline ON inventoryitem.icmasterid=inventoryline.icmasterid 
WHERE inventoryitem.icmasterid < 'WAD18' and inventoryitem.icmasterid like 'WAD%' 
ORDER BY inventoryitem.icmasterid

上面给出了清单项目中的所有项目以及它们与预期相关的清单行记录。

但是当我添加

and inventoryline.pomasterid <> ''

我只有两行。

icmasterid  ICdescription                      icdetailquantity   pomasterid
WAD110796   WM KIWI-KLIP 3 BEND (MZ3,4,&6)                  0   119450
WAD110796   WM KIWI-KLIP 3 BEND (MZ3,4,&6)                900   119347

我需要的是

icmasterid     icdescription                      icdetailquantity  pomasterid
WAD110796      WM KIWI-KLIP 3 BEND (MZ3,4,&6)                    0  119450
WAD110796      WM KIWI-KLIP 3 BEND (MZ3,4,&6)                  900  119347
WAD118806-50   STROLLER VALENCE BACKDRP HINGE                  NULL NULL
WAD118808      IK STROL B DROP MOUNTING HDW                    NULL NULL
WAD118942      1" S-HOOK BAG 100                               NULL NULL

Answer 1

将WHERE子句中的逻辑移到ON子句：

SELECT
    ii.icmasterid,
    ii.icdescription,
    ii.icdetailquantity,inventoryline.pomasterid
FROM inventoryitem ii
LEFT JOIN inventoryline il
     ON ii.icmasterid = il.icmasterid AND
        -- SUBSTRING(ii.icmasterid, 4, 2) < '18' AND
        ii.icmasterid LIKE 'WAD%' 
ORDER BY
    ii.icmasterid;

Answer 2

根据蒂姆·比格莱森（Tim Biegeleisen）的回答，我想到了这一点。

SELECT
    ii.icmasterid,
    ii.icdescription,
    ii.icdetailquantity,inventoryline.pomasterid
FROM inventoryitem ii
LEFT JOIN inventoryline il
    ON ii.icmasterid = il.icmasterid AND and inventoryline.pomasterid <> ''
WHERE
    ii.icmasterid < 'WAD18' AND
    ii.icmasterid LIKE 'WAD%' 
ORDER BY
    ii.icmasterid;