小编wea*_*re1的帖子

从一个表中获取所有内容,从另一个表中获取COUNT

K,所以我有两张桌子:

categories
+----+----------+
| id | slug     |
+----+----------+
| 1  | billing  |
| 2  | security |
| 3  | people   |
| 4  | privacy  |
| 5  | messages |
+----+----------+

categories_questions
+------------------+-------------+
| id | question_id | category_id |
+------------------+-------------+
| 1  |           1 |           2 |
| 2  |           2 |           5 |
| 3  |           3 |           2 |
| 4  |           4 |           4 |
| 5  |           4 |           2 | …
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mysql sql select

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