以下的文章主要描述的是SQL Server Rollup关键字的具体使用技巧，在其实际操作中我们首先是创建测试表、添加数据，以下就是文章的主要内容的详细描述，望大家在浏览之后会对其有更深的了解。
create table #t(a int,b int,c int,d int,e int) insert into #t values(1,2,3,4,5) insert into #t values(1,2,3,4,6) insert into #t values(1,2,3,4,7) insert into #t values(1,2,3,4,8) insert into #t values(1,3,3,4,5) insert into #t values(1,3,3,4,6) insert into #t values(1,3,3,4,8) insert into #t values(1,3,3,4,7) insert into #t values(2,2,2,4,5) insert into #t values(2,2,3,4,6) insert into #t values(2,2,4,4,7) insert into #t values(2,2,5,4,8) insert into #t values(2,3,6,4,5) insert into #t values(2,3,3,4,6) insert into #t values(2,3,3,4,8) insert into #t values(2,3,3,4,7)
情况一：只有一个分类汇总列时，只需要一个合计。只需要增加with rollup即可。
select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, sum(b),sum(c),sum(d),sum(e) from #t group by a with rollup
情况二:有多个分类汇总列，只需要一个合计.增加SQL Server rollup之后，需要增加判断。
select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, b, sum(c),sum(d),sum(e) from #t group by a,b with rollup having grouping(b)=0 or grouping(a)=1select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, b, c, sum(d),sum(e) from #t group by a,b,c with rollup having grouping(c)=0 or grouping(a)=1
情况三：有多个分类汇总列，需要全部的小计和合计。
select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, case when grouping(b)=1 and grouping(a)=0 then '小计' else cast(b as varchar) end b, case when grouping(c)=1 and grouping(b)=0 then '小计' else cast(c as varchar) end c, sum(d),sum(e) from #t group by a,b,c with rollup
另外一种显示小计的方式
select case when grouping(a)=1 then '合计' when grouping(b)=1 then cast(a as varchar)+'小计' else cast(a as varchar) end a, case when grouping(b)=0 and grouping(c)=1 then cast(b as varchar)+'小计' else cast(b as varchar) end b, case when grouping(c)=1 and grouping(b)=0 then '' else cast(c as varchar) end c, sum(d),sum(e) from #t group by a,b,c with rollup
情况四：有多个分类汇总列，需要部分的小计和合计
select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, b, case when grouping(c)=1 and grouping(b)=0 then '小计' else cast(c as varchar) end c, sum(d),sum(e) from #t group by a,b,c with rollup having grouping(a)=1 or grouping(b)=0 select case when grouping(a)=1 then '合计' else cast(a as varchar) end a, case when grouping(b)=1 and grouping(a)=0 then '小计' else cast(b as varchar) end b, c, sum(d),sum(e) from #t group by a,b,c with rollup having grouping(a)=1 or grouping(b)=1 or grouping(c)=0
上述的相关内容就是对SQL Server Rollup关键字使用技巧的描述，希望会给你带来一些帮助在此方面。