mysql 两个表同时查询出现错误

Question

要做一个站内搜索引擎，同时搜索两个表给出结果，我的代码如下：

(SELECT * FROM `#@__infoimg`    WHERE  title LIKE '%$keyword%' AND delstate='' AND checkinfo=true) UNION ALL (SELECT * FROM `#@__infolist` WHERE  title LIKE '%$keyword%' AND delstate='' AND checkinfo=true) ORDER BY ID DESC

运行出现错误：union detect 请高人指点啊

Answer 1

https://ask.csdn.net/questions/877428
参考小宝老师的回答