犀利兵

摘要：一个统计需求，需要统计产品表中下线产品数量、上线产品数量、热销产品数量、折扣产品数量。要求用一个SQL语句实现！想到用sum(case when ...then ... end), 如下所示：Select Sum(case when IsOnline = 1 then 1 else 0 end) as OnlineProducts,Sum(case when IsOnline = 0 then 1 else 0 end) as OfflineProducts,Sum(case when IsHot = 1 then 1 else 0 end) as HotProducts,Sum(case . 阅读全文