SQL 将先前的行余额除以当前行余额并将该值插入当前行列 "Growth"

Question

我有一个 table 这样的地方。

Year	ProcessDate	Month	Balance	RowNum
2022	20220430	4	22855547	1
2022	20220330	3	22644455	2
2022	20220230	2	22588666	3
2022	20220130	1	33545444	4
2022	20221230	12	22466666	5

我需要用每一列的前一行除以当前行。

例如：第 1 行计算应 = 第 2 行余额/第 1 行余额 (22644455/22855547 = .99%) 第 2 行计算应 = 第 3 行余额/第 2 行余额等....

Table 只是我创建的临时 table 标题为 #MonthlyLoanBalance2。现在我只需要更进一步。让我知道你会做什么以及如何去做。提前致谢！

Insert into #MonthlytLoanBalance2 (
Year
,ProcessDate
,Month
,Balance
,RowNum
)
select 
--CloseYearMonth,
left(ProcessDate,4) as 'Year',
ProcessDate,
--x.LOANTypeKey,
SUBSTRING(CAST(x.ProcessDate as varchar(38)),5,2) as 'Month',
sum(x.currentBalance) as Balance
,ROW_NUMBER()over (order by ProcessDate desc) as RowNum
from
(
select 
distinct LoanServiceKey,
LoanTypeKey,
AccountNumber,
CurrentBalance,
OpenDateKey,
CloseDateKey,
ProcessDate


from
cu.LAFactLoanSnapShot
where LoanStatus = 'Open'
and LoanTypeKey = 0
and ProcessDate in (select DateKey from dimDate
where IsLastDayOfMonth = 'Y'
and DateKey > convert(varchar, getdate()-4000, 112)

)

) x

group by ProcessDate
order by ProcessDate desc;``

Answer 1

我假设您的数据已经准备好，如 table 中所示。现在您可以尝试 Lead() 函数来解决您的问题。请记住 format() 函数仅用于取两个精度。

SELECT *,
    FORMAT((ISNULL(LEAD(Balance,1) OVER (ORDER BY RowNum), 1)/Balance),'N2') Calculation
FROM #MonthlytLoanBalance2

SQL 将先前的行余额除以当前行余额并将该值插入当前行列 "Growth"

SQL Divide previous row balance by current row balance and insert that value into current rows column "Growth"

sql

sql-server