SQL Server中Rollup关键字使用技巧

首先创建测试表、添加数据。

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)=1
select 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