在联接表中选择所有不满足某些条件的记录

本文介绍了在联接表中选择所有不满足某些条件的记录的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

假设我们在这里有两个表，即帖子和评论，关系是一对多的，在评论表中有一个字段调用comment_date.

Let's say we have two tables here , posts and comments, the relations is one to many, there has a field call comment_date in the comments table.

现在，我很难获得预期的结果，如下所示:

Now I am struggle to get the expected results as follow:

所有帖子在特定日期后都没有评论，我可以通过SQL语句来完成此操作吗?

All the posts have no comments after a certain date, can I done this by a SQL statement?

推荐答案

SELECT * FROM posts p WHERE NOT EXISTS( SELECT 1 FROM comments c WHERE cment_date >= 'deadline' AND p.post_id = c.post_id )