我需要将一个金额拆分成多个部分并插入一个名为installment的表中,如何在不使用循环的情况下实现它?
declare @installment as table (installment_index int identity(1,1),
amount money,
due_date datetime)
declare @total_amount money
declare @number_of_installment int
declare @amount money
declare @i int
declare @date datetime
set @date = getdate()
set @number_of_installment = 20
set @total_amount = 5001.00
set @amount = @total_amount / @number_of_installment
set @i= 1
while @i <= @number_of_installment
begin
insert into @installment
(amount,due_date) values (@amount, dateadd(month,@i,@date))
set @i = @i + 1
end
答案 0 :(得分:5)
这将取代while循环:
;with numbers as (
select 1 number
union all
select number + 1
from numbers
where number < @number_of_installment
)
insert into @installment (amount,due_date)
select @amount, dateadd(month,number,@date)
from numbers
option (maxrecursion 0)
CTE编号返回从1到@number_of_installment的数字表 insert使用此表将@number_of_installment记录插入@installment。
编辑:
我必须提到的是,根据this article,为了类似的目的,没有什么比数字/日期的辅助表更好。