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我需要获得基于另一个值的原始SQL查询的帮助。MySQL - 合并两个连接结果
我有以下的原始SQL查询。
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;
,这导致了以下内容:
+----+------+-------+------+------+
| id | name | units | str | str |
+----+------+-------+------+------+
| 14 | Area | mm2 | 1.1 | NULL |
+----+------+-------+------+------+
的问题,我都获得和pmPropShort.str和pmPropLong.str我应该是投注一个或另一个。我真正想要的是一个单独的str值?如何重新编写此查询以满足我的需求?
不要忘了给它一个别名,e.g.'AS str' –
真棒!非常感谢! – rh0dium