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我需要獲得基於另一個值的原始SQL查詢的幫助。MySQL - 合併兩個連接結果
我有以下的原始SQL查詢。
SELECT pmPropDef.id, pmPropDef.name, pmPropDef.units, pmPropShort.str, pmPropLong.str
FROM pmProp INNER JOIN pmPropDef ON pmProp.propid=pmPropDef.id AND pmPropDef.name = 'Area'
LEFT JOIN pmPropShort ON sid=pmProp.value
LEFT JOIN pmPropLong ON lid=-pmProp.value
WHERE pmProp.ownertype='variant' AND pmPropDef.id = pmProp.propid;
,這導致了以下內容:
+----+------+-------+------+------+
| id | name | units | str | str |
+----+------+-------+------+------+
| 14 | Area | mm2 | 1.1 | NULL |
+----+------+-------+------+------+
的問題,我都獲得和pmPropShort.str和pmPropLong.str我應該是投注一個或另一個。我真正想要的是一個單獨的str值?如何重新編寫此查詢以滿足我的需求?
不要忘了給它一個別名,e.g.'AS str' –
真棒!非常感謝! – rh0dium