在一个查询中从两个表中删除

您不能用分号分隔它们吗？

Delete from messages where messageid = '1';Delete from usersmessages where messageid = '1'

要么

只需

INNER JOIN

DELETe messages , usersmessages  FROM messages  INNER JOIN usersmessages  WHERe messages.messageid= usersmessages.messageid and messages.messageid = '1'