在SQLServer2008中分解摘要表

根据计数的范围,您可以使用一个查找表,该表为每个整数x正好保存x条记录。这样地:

create table counter(num int)
insert into counter select 1

insert into counter select 2
insert into counter select 2

insert into counter select 3
insert into counter select 3
insert into counter select 3

insert into counter select 4
insert into counter select 4
insert into counter select 4
insert into counter select 4

create table source(age int, gender char(1), num int)
insert into source select 40, 'm', 3
insert into source select 30, 'f', 2
insert into source select 20, 'm', 1

--insert into destination(age, gender)
    select age, gender
    from source
        inner join counter on counter.num = source.num

从“worksonmymachine(TM)”稳定的递归查询中,使用所有关于最大递归深度的常见警告。

with Expanded(exAge, exGender, exRowIndex) as
(
    select
        Age as exAge, 
        Gender as exGender, 
        1 as exRowIndex
    from
        tblTest1
    union all
        select
            exAge,
            exGender,
            exRowIndex+1
        from
            tblTest1 t1 
            inner join
            Expanded e on (e.exAge = t1.Age and e.exGender = t1.Gender and e.exRowIndex < t1.Count)         
)
select
    exAge, 
    exGender, 
    exRowIndex
from
    Expanded
order by 
    exAge, 
    exGender, 
    exRowIndex
option (MAXRECURSION 0)  -- BE CAREFUL!!