'where 子句 [MySQL] 中的未知列 '"'

Question

我收到此错误 Erreur SQL (1054)：'where clause'[= 中的未知列 'pk.post_id' 19=] 当我尝试执行此查询时。

UPDATE `wp_posts` as pm SET pm.post_content = (select meta_value from `wp_postmeta` as pk where pk.post_id = pm.id and pk.meta_key = "_job_description") WHERE pm.id = pk.post_id;

我没有找到解决方法。你能帮我吗？

Answer 1

您必须使用多个-table更新语法：

UPDATE `wp_posts` as pm  
JOIN `wp_postmeta` as pk ON pm.id = pk.post_id 
                        AND pk.meta_key = '_job_description'
SET pm.post_content = pk.meta_value;

见https://dev.mysql.com/doc/refman/8.0/en/update.html

'where 子句 [MySQL] 中的未知列 '"'

Unknown column '"' in 'where clause [MySQL]

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