工会正在合并结果

Question

我有一个看起来如下的查询:

(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中的结果相同,与第三个选择相同.

问题是重复的结果自动被删除但我希望他们留在它.谁知道如何实现这一目标？

Answer 1

请UNION ALL改用.