如何通过mysql删除wordpress中没有特色图片的帖子？

您遇到的问题是，您正在为各种事情拉回“ post_id”。

您想要的meta_key值是“ _thumbnail_id”，它将父帖子存储在post_id中。

如果要删除，后果自负，可以先尝试执行SELECT而不是DELETE，以确保这样做符合您的实际需求：

DELETE FROM wp_posts WHERE ID not in (select post_id as p from wp_postmeta where meta_key like "_thumbnail_id"); 

更新：这是我的验证测试。

创建了新帖子（7161），然后添加了特征图片。

mysql> select * from wp_postmeta where post_id IN(7161,7162);
+---------+---------+---------------+---------------------+
| meta_id | post_id | meta_key      | meta_value          |
+---------+---------+---------------+---------------------+
|   12533 |    7161 | _edit_lock    | 1512581739:1        |
|   12534 |    7161 | _edit_last    | 1                   |
|   12549 |    7161 | _thumbnail_id | 7115                |
|   12543 |    7161 | CODE1         |                     |
|   12544 |    7161 | _CODE1        | field_57e4293a9238c |
|   12545 |    7161 | CODE3         |                     |
|   12546 |    7161 | _CODE3        | field_57e4297c9238d |
|   12547 |    7161 | CODE2         |                     |
|   12548 |    7161 | _CODE2        | field_57e42ceb508ff |

创建了wp_posts表的副本

create table wp_posts_test like wp_posts;
  Query OK, 0 rows affected (0.01 sec)

并从wp_posts加载实时数据。

insert into wp_posts_test select * from wp_posts;
  Query OK, 6938 rows affected (0.30 sec)

然后运行我的测试查询以删除没有特色图片的所有内容：

delete from wp_posts_test WHERE ID NOT IN (select post_id from wp_postmeta where meta_key="_thumbnail_id"); 
   Query OK, 6937 rows affected (0.37 sec)

检查表，只有一条记录，这是我想保留的帖子：

select * from wp_posts_test \G

*************************** 1. row ***************************
                   ID: 7161
          post_author: 1
            post_date: 2017-12-06 09:29:20
        post_date_gmt: 2017-12-06 17:29:20
         post_content: This is just a test post to see if the featured image OR the post is nuked using a mysql hack.   Standby for destruction. 
           post_title: Feature Image Test Post
        post_category: 0
         post_excerpt: 
          post_status: publish
       comment_status: open
          ping_status: open
        post_password: 
            post_name: feature-image-test-post
              to_ping: 
               pinged: 
        post_modified: 2017-12-06 09:35:18
    post_modified_gmt: 2017-12-06 17:35:18 
post_content_filtered: 
          post_parent: 0
                 guid: http://blog.daviddemartini.com/?p=7161
           menu_order: 0
            post_type: post
       post_mime_type: 
        comment_count: 0

设置1行（0.00秒）

如果您想删除与特色图片没有关联的wp_posts中的所有记录，对我来说似乎很好。为什么它可能对您不起作用，对我来说还是个谜。