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。
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