Table "posts" contains articles and 3 last userIDs (us1, us2, us3) of people who posted comments to each article. I need to join "usertable" to get names of last comment posters. This is my query:Table "posts" contains articles and 3 last user
阅读背景：
同一个表上的MySQL多个连接在while循环中仅选择1行
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