Question

我有一张TaxID，Price，DatePurchaced的表格每个TaxId多次显示不同的价格和DatePurchaced 我想通过TaxId按Sum（Price）分组，并显示最后一个DatePurchaced 我还想要一个带有Count（TaxID）的列我尝试了ome查询，但总是向我显示一条记录，其中包含最新的datePurchaced

Answer 1

declare @tbl as table (TaxID int, Price money, DatePurchaced datetime)

insert into @tbl (TaxID, Price, DatePurchaced) values (1, 10.5, '2015-03-05 10:25:23');
insert into @tbl (TaxID, Price, DatePurchaced) values (1, 13, '2015-03-09 10:25:23');
insert into @tbl (TaxID, Price, DatePurchaced) values (1, 7, '2015-03-20 10:25:23');
insert into @tbl (TaxID, Price, DatePurchaced) values (2, 10.5, '2015-07-05 10:25:23');
insert into @tbl (TaxID, Price, DatePurchaced) values (2, 8, '2015-07-08 10:25:23');


select  t.TaxId as TaxID, 
        count(t.TaxId) as Cnt,
        sum(t.Price) as TotalPrice,
        max(t.DatePurchaced) as LastPurchaseDate
from @tbl as t
group by t.TaxId

访问SQL查询组

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