子查询 - mysql如何把多行数据合并到一行的多列中

Question

如图是我筛选出来的数据，语句是select time,wish_num,num from wish_num where time &gt;= '15296000' and time &lt;= '1495382399' group by time,wish_num，time和wish_num是联合主键现在我希望把同一个日期中...

怪我咯 · Answer

最简单就是group_concat了，楼主不用那就只好case when了，由于楼主group by之后的num并没有使用聚合函数，因此我理解为num只有一个值？sql如下

select time,
max(case when wish_num=1 then num else 0) '1',
max(case when wish_num=2 then num else 0) '2',
max(case when wish_num=5 then num else 0) '5',
max(case when wish_num=10 then num else 0) '10',
max(case when wish_num=20 then num else 0) '20'
from wish_num where time >= '15296000' and time <= '1495382399' group by time;