update wp_postmeta set `meta_value`=价格 WHERE `meta_key` ='价格字段' AND post_id IN (SELECT object_id AS post_id FROM `wp_term_relationships` WHERE term_taxonomy_id =分类id )

update wp_postmeta set `meta_value`='要改的值' WHERE `meta_key` ='要改的字段名' AND post_id IN (SELECT object_id AS post_id FROM `wp_term_relationships` WHERE term_taxonomy_id =分类id )

执行成功图供参考,另外搞之前先备份数据库有风险

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