php - 異なるテーブルの 2 つのクエリを結合する

Question

これら 2 つのクエリを 1 つに結合するにはどうすればよいですか?

特定のカテゴリからすべての posts_id を取得する最初のクエリ。post_category テーブルの postId が post テーブルの id と等しい

select distinct postId 
  from post_category 
  where categoryId='125' or categoryId='3'

それから私はそれらに参加したいので、投稿テーブルのpost_categoryからすべてのpostIdを選択します

SELECT * FROM post <<query one join>> AND approve=1"

役職

  +--------------+-----------------------+------+-----+---------------------+----------------+
    | Field        | Type                  | Null | Key | Default             | Extra          |
    +--------------+-----------------------+------+-----+---------------------+----------------+
    | id           | int(11)               | NO   | PRI | NULL                | auto_increment |
    | autor        | varchar(40)           | NO   | MUL |                     |                |
    | date         | datetime              | NO   | MUL | 0000-00-00 00:00:00 |                |
    | short_story  | text                  | NO   | MUL | NULL                |                |
    | full_story   | text                  | NO   | MUL | NULL                |                |
    | xfields      | text                  | NO   |     | NULL                |                |
    | title        | varchar(255)          | NO   | MUL |                     |                |
    | descr        | varchar(200)          | NO   | MUL |                     |                |
    | keywords     | text                  | NO   |     | NULL                |                |
    | category     | varchar(200)          | NO   | MUL | 0                   |                |
    | alt_name     | varchar(200)          | NO   | MUL |                     |                |
    | comm_num     | mediumint(8) unsigned | NO   | MUL | 0                   |                |
    | allow_comm   | tinyint(1)            | NO   |     | 1                   |                |
    | allow_main   | tinyint(1) unsigned   | NO   | MUL | 1                   |                |
    | approve      | tinyint(1)            | NO   | MUL | 0                   |                |
    | fixed        | tinyint(1)            | NO   |     | 0                   |                |
    | allow_br     | tinyint(1)            | NO   |     | 1                   |                |
    | symbol       | varchar(3)            | NO   | MUL |                     |                |
    | tags         | varchar(255)          | NO   | MUL |                     |                |
    | metatitle    | varchar(255)          | NO   |     |                     |                |
    | FileTempUUID | varchar(11)           | YES  |     | NULL                |                |
    +--------------+-----------------------+------+-----+---------------------+----------------+

post_category;

+------------+-------------+------+-----+---------+----------------+
| Field      | Type        | Null | Key | Default | Extra          |
+------------+-------------+------+-----+---------+----------------+
| cid        | bigint(11)  | NO   | PRI | NULL    | auto_increment |
| postId     | int(11)     | NO   |     | NULL    |                |
| categoryId | smallint(6) | NO   |     | NULL    |                |
+------------+-------------+------+-----+---------+----------------+