how to get the difference between dates from a table using an SP

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Hi Have the following records in my table:

CSS

DateId  Date                      InstId
1       2013-09-01 00:00:00.000      1
2       2013-09-09 00:00:00.000      1
3       2013-09-01 00:00:00.000      1
4       2013-09-08 00:00:00.000      1
5       2013-09-15 00:00:00.000      2
6       2013-09-22 00:00:00.000      2
7       2013-09-01 00:00:00.000      3
8       2013-09-15 00:00:00.000      3
9       2013-09-29 00:00:00.000      3

Now what I want is to get the difference between two consecutive Dates and compare if the difference is less then 30 days or not where InstId is same.
example
-if Date2 - Date1 > 30 then do something
-if Date3 - Date2 > 30 the do something, etc...

How to perform this, using a stored procedure?

Posted 28-Sep-13 3:56am

El Dev

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Azee 28-Sep-13 11:18am

Could you please specify the possible output that you would expect from the stored procedure?

El Dev 28-Sep-13 11:31am

I want to charge an interest to customers if the difference between 2 dates exceed 30 days...means if I give a customer a loan of $300 to be paid in 3 installment for $100,if the customer exceed 30 days he will star paying interest of $10 for each 30 days.

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**Azee** · Accepted Answer · 2013-09-28T05:57:00

I am not sure how you would wanna use it but here are two different scenario to use the days difference.
The first one gets you the Days difference between consecutive records with same IntsId

SQL

select ISNULL(DATEDIFF(dd,M1.Date, (Select [Date] from MyTable where dateId = M1.dateId + 1 and InstId = M1.InstId)), 0) as diff from MyTable M1

The second one checks if there are any consecutive records with same InstId with difference greater than 30.

SQL

select 'Charge 10%' as Fine  from MyTable M1
where  ISNULL(DATEDIFF(dd,M1.Date, (Select [Date] from MyTable where dateId = M1.dateId + 1 and InstId = M1.InstId)), 0) > 30

Hope it helps.

Good luck