除了这种方法,有没有更好的
select id,time1 as time from table1 where time1<time2
union
select id,time2 as time from table1 where time1>time2
select id,time1 as time from table1 where time1<time2
union
select id,time2 as time from table1 where time1>time2
调试欢乐多
解决方案 »
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