union 正在合并结果
我有一个如下所示的查询：
(SELECT title FROM pjeducations LIMIT 5)
UNION
(SELECT title FROM pjeducations WHERE animal != "all" LIMIT 5)
UNION
(SELECT title FROM pjeducations ORDER BY price DESC LIMIT 5)
第二个选择中的一些结果与第一个选择中的结果相同，与第三个选择中的结果相同。
问题是重复的结果会自动被删除，但我希望它们保留在其中。有人知道如何实现这一目标吗？
i have a query that looks as following:
(SELECT title FROM pjeducations LIMIT 5)
UNION
(SELECT title FROM pjeducations WHERE animal != "all" LIMIT 5)
UNION
(SELECT title FROM pjeducations ORDER BY price DESC LIMIT 5)
Some of the results in the second select are the same as in the first, same with the third select.
The problem is that the duplicate results automaticly get removed but i would like them to stay in it. Anyone know how to achieve this?
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请改用
UNION ALL。Use
UNION ALLinstead.保留重复结果
preserved duplicate results