按半月:完整代码:
SELECT siteNumber [站点],
CONVERT(VARCHAR(7),day,120)+'-'+
case when day(day) between 1 and 15 then '上半月' else '下半月' end [半月],
SUM(rainVal) [半月降雨量]
FROM r a
GROUP BY CONVERT(VARCHAR(7),day,120)+'-'+
case when day(day) between 1 and 15 then '上半月' else '下半月' end,
siteNumber
order by siteNumber, CONVERT(VARCHAR(7),day,120)+'-'+
case when day(day) between 1 and 15 then '上半月' else '下半月' end
按月分组:
select year(ordertime) 年，
month(ordertime) 月,
sum(Total) 销售合计
from 订单表
group by year(ordertime)，
month(ordertime