This is intermediate level SQL scripting article for DB Administrator, Programmer, IT Specialist

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Let's look at interest calculation techniques.

Imagine that you are financing institution and have multiple customers in two companies, where you need to predict interest. The following procedure will do the job:

CREATE PROCEDURE AST_Interest_Calculation
@Company1 varchar(10),--Great Plains SQL database ID
@Company2 varchar(10),
@Accountfrom varchar(60),
@Accountto varchar(60),
@Datefrom datetime,
@Dateto datetime--,
as
declare @char39 char --for single quote mark
declare @SDatefrom as varchar(50)
declare @SDateto as varchar(50)
select @SDatefrom = cast(@Datefrom as varchar(50))
select @SDateto = cast(@Dateto as varchar(50))
select @char39=char(39)
if not exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[AST_INTEREST_TABLE]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
CREATE TABLE [dbo].[AST_INTEREST_TABLE] (
[YEAR] [int] NULL ,
[MONTH] [int] NULL ,
[COMPANYID] [varchar] (4) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[ACTNUMST] [char] (129) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[BEGINDATE] [varchar] (19) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[ENDDATE] [varchar] (19) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[YEARDEGBALANCE] [numeric](19, 5) NULL ,
[BEGBALANCE] [numeric](38, 5) NULL ,
[ENDBALANCE] [numeric](38, 5) NULL ,
[INTERESTONBALANCE] [numeric](38, 6) NULL ,
[INTERESONTRANSACTIONS] [numeric](38, 8) NULL ,
[INTEREST] [numeric](38, 6) NULL  ) ON [PRIMARY]
exec("
delete AST_INTEREST_TABLE where [YEAR] = year("+ @char39 + @Datefrom + @char39 +") and [MONTH]=month("+ @char39 + @Datefrom + @char39 +")
insert into AST_INTEREST_TABLE
select
year(X.BEGINDATE) as [YEAR],
month(X.BEGINDATE) as [MONTH],
X.COMPANYID,
X.ACTNUMST,
X.BEGINDATE as BEGINDATE,
X.ENDDATE as ENDDATE,
X.YEARBEGBALANCE as YEARDEGBALANCE,
X.YEARBEGBALANCE+X.BEGBALANCE as BEGBALANCE,
X.YEARBEGBALANCE+X.ENDBALANCE as ENDBALANCE,
X.INTERESTONBALANCE as INTERESTONBALANCE,
X.INTERESTONTRANSACTIONS as INTERESONTRANSACTIONS,
X.INTERESTONBALANCE+X.INTERESTONTRANSACTIONS as INTEREST
--into AST_INTEREST_TABLE
from
(
select
"+ @char39+ @Company1 + @char39+" as COMPANYID,
a.ACTNUMST,
"+ @char39 + @Datefrom + @char39 +" as BEGINDATE,
"+ @char39 + @Dateto + @char39 +" as ENDDATE,
case when
b.PERDBLNC is null then 0
elseb.PERDBLNC
end as YEARBEGBALANCE,
sum
(
case
when (c.DEBITAMT-c.CRDTAMNT is not null and c.TRXDATE ="+ @char39 + @SDatefrom + @char39 +" and c.TRXDATE =year("+ @char39 + @Datefrom + @char39 +")
where
a.ACTNUMST>="+@char39+@Accountfrom+@char39 +"
and a.ACTNUMST="+ @char39 + @SDatefrom + @char39 +" and c.TRXDATE =year("+ @char39 + @Datefrom + @char39 +")
where
a.ACTNUMST>="+@char39+@Accountfrom+@char39 +"
and a.ACTNUMST<="+@char39+@Accountto+@char39 +"
group by
a.ACTNUMST,
case when
b.PERDBLNC is null then 0
elseb.PERDBLNC
end,
d.USERDEF1
) X
")

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