mysql - 一个 MySQL 查询中的两个独立请求

Question

我试图通过使用来自两个不同表的 MySQL 查询来获取多个帖子和特定帖子的元值:

SELECT SUM(CASE WHEN post_type='updates' AND post_status='publish' THEN 1 ELSE 0 END) AS updates FROM wp_posts, 
LEFT JOIN meta_value FROM wp_postmeta WHERE meta_key=content_version AND post_id=11242 AS version

表 wp_posts 看起来像:

|    ID   |    title   | post_type |  post_status  |
----------------------------------------------------
|    32   | Post Title |  updates  |    publish    |

表 wp_postmeta 看起来像:

| post_id |     meta_key    | meta_value |
-----------------------------------------
|  11242  | content_version |      1     |

无论如何我都无法取得成果。你能帮我一下吗？

Answer 1

SELECT SUM(CASE WHEN post_type='post' AND post_status='publish' THEN 1 ELSE 0 END) AS updates, meta_value AS VERSION FROM wp_posts,wp_postmeta WHERE meta_key='content_version' AND post_id=11242

更新了我的查询