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Message Posted: Sat, 05 Sep 2009 @ 08:46:18 GMT


     
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Subj:   Using a case Statement in a where clause
 
From:   Thakur, Sachin

Hello,

I am new to Teradata and have a SQL Server background. Thanks for your help

Question:

I am trying to write a query in which I need to assign a filter based on day of the week

     Select * from Loan
     Where Application_Date between  Date and (Date-1)

I want to make this dynamic so if it s a Monday the where clause should change to Application_Date between Date and (Date-3).

I read the post about using sys.calendar table to get the week day, however I am unable write a case statement within the Where clause to get the logic I need

I tried to take a swing at it but it gives me syntax errors. The query I use is mentioned below. Also I don t have the permissions to create variables or stored procedures I am trying to implement this with SSIS.

     Select * from Loan
     Where
       Case when (select day_of_week    from sys_calendar.calendar   where
     calendar_date = date ) <>  2  Application_Date  between  date - 1 AND date - 1
        else     infx_loan_app_date_ln000_date  between  date - 3 AND date - 1
        end


     
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