Join all rows from two different tables MySQL

Question

I've been trying to join all the rows from two different tables. I've tried UNION and LEFT JOIN.

Right now I've just been using two separate queries and had one display after the other. I would like to merge the two queries to display at the same time.

table 1 is called 'approves' and table 2 is called 'comments'.

批准
- id
- postID
- postUserID
- userID

评论
- id
- postID
- postUserID
- 用户 ID
- 评论
- 日期

Answer 1

这是一个 UNION 的例子

select id, postID, postUserID, userID, comment, date from comments
union
select id, postID, postUserID, userID, null, null from approves