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VB pmt function in SQL

Posted on 2014-03-12
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Last Modified: 2014-03-24
I have some vb that works out loan repayments but i need to code into a stored procedure.

I've found that there is no pmt function in sql to do this. Can anyone help me write the following in SQL?


Math.Round(Pmt(0.119 / 12, 300, -17030), 2)

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Question by:Ed
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3 Comments
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 39925179
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LVL 28

Accepted Solution

by:
Ryan McCauley earned 2000 total points
ID: 39946877
Looks like somebody may have already written a function for you that does this exact calculation (from http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=55819):

create function dbo.PMT
	(
	-- Datetype for @rate changed to float
	@rate float,
	@periods smallint,
	@principal numeric(20,2)
	)
returns numeric (38,9)
as
begin
declare @pmt numeric (38,9)

declare @WK_periods float,
	@WK_principal float,
	@wk_One float,
	@WK_power float

-- Convert data for calculation
select  @WK_periods = @periods,
	@WK_principal = @principal,
	@WK_One = 1

select  @pmt =
round(
-- Do all multiplication before division
( @WK_principal * (@rate*power(@WK_One+@rate,@WK_periods)))
/ (power(@WK_One+@rate,@WK_periods)-@WK_One)
,9)

return @pmt

end
go

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And it would be a direct swap in your example above:

= CONVERT(NUMERIC(20,2), CONVERT(INT, dbo.PMT(0.119 / 12, 300, -17030) * 100))/100

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Author Closing Comment

by:Ed
ID: 39949913
perfect thanks
0

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