mysql多个条件分列显示的问题

Question

SELECT dir3.url from dir3 LEFT JOIN dir4 on dir4.url=dir3.url where dir4.id is null or dir3.md5<>dir4.md5 and dir3.inputtime=1453086000

现在这条语句，把两个条件的结果都显示在一列
因为我需要分开处理，所以希望能改成两列显示
SELECT dir3.url from dir3 LEFT JOIN dir4 on dir4.url=dir3.url where dir4.id is null and dir3.inputtime=1453086000为一列
SELECT dir3.url from dir3 LEFT JOIN dir4 on dir4.url=dir3.url dir3.md5<>dir4.md5 and dir3.inputtime=1453086000为一列
希望大神帮忙，在线等

Answer 1

 SELECT dir3.url as url1,'' as url2 from dir3 LEFT JOIN dir4 on dir4.url=dir3.url where dir4.id is null and dir3.inputtime=1453086000
 union all
 SELECT '' as url1,dir3.url as url2 from dir3 LEFT JOIN dir4 on dir4.url=dir3.url dir3.md5<>dir4.md5 and dir3.inputtime=1453086000