数据存储在wp\\U posts和wp\\U POSTETA表中。执行以下操作可以查看所有字段值：

SELECT website from 

(SELECT m1.meta_value as user_firstname, m2.meta_value as user_lastname, m3.meta_value as website
 FROM dev_posts
 join dev_postmeta m1 on m1.post_id = ID and m1.meta_key = \'_field_1\'
 join dev_postmeta m2 on m2.post_id = ID and m2.meta_key = \'_field_2\'
 join dev_postmeta m3 on m3.post_id = ID and m3.meta_key = \'_field_3\'
 where post_type = \'nf_sub\') as v1

WHERE user_firstname = \'John\' AND user_lastname = \'Allen\'

资料来源：https://www.experts-exchange.com/questions/28910247/Where-is-Ninja-form-data-stored-in-the-WordPress-database.html

一旦获得内容，就可以将其存储在任何表中。