select sum(case when b.mingcheng='北京' then a.renshu else 0 end) '北京人数',sum(case when b.mingcheng='上海' then a.renshu else 0 end) '上海人数'
from Tbl_checkIn a,tbl_PiaoLei b
where a.piaolei=b.bianhao
and CheckInTime>= '2012-10-01'
and CheckInTime<= '2012-10-07'
and CheckInNo='01'
请教各位老师,这个是查询几天的合计人数,如何把查询出来的结果每天显示北京多少人,上海多少人呢?请问应该怎么写?谢谢!
from Tbl_checkIn a,tbl_PiaoLei b
where a.piaolei=b.bianhao
and CheckInTime>= '2012-10-01'
and CheckInTime<= '2012-10-07'
and CheckInNo='01'
GROUP BY CheckInTime
没数据不好改,你试试
COUNT(b.mingcheng) AS [人数]
FROM Tbl_checkIn a INNER JOIN
tbl_PiaoLei b
where a.piaolei=b.bianhao
and CheckInTime>= '2012-10-01'
and CheckInTime<= '2012-10-07'
and CheckInNo='01'
GROUP BY b.mingcheng