小编ick*_*ckx的帖子

我需要UNION两个查询中的一个，每个查询都单独工作，但不能一起工作，我收到错误：重复的列名zipcode_id，请帮助。

(SELECT * FROM
    ( (SELECT * FROM jobs AS j LEFT JOIN zipcode AS z ON z.zipcode_id=j.zipcode_id WHERE 1 AND source='student'
              ORDER BY postdate DESC LIMIT 20) ORDER BY search_order DESC ) 
s1)
    UNION ALL
(SELECT * FROM
        (  (SELECT * FROM jobs AS j LEFT JOIN zipcode AS z ON z.zipcode_id=j.zipcode_id WHERE 1 AND source='manager'
               ORDER BY postdate DESC LIMIT 30, 1000000) ORDER BY postdate DESC )
s2)