Question

DATEADD using table driven values

Asked by: 3Si_pnewman

In SQL Server 2005 I have a table which is used to hold frequencies, I use these values in my project to establish an end date from a user enterd start date.  My problem occurs when I try to use the fields as part of the DATEADD function in a query, for example:

CREATE TABLE FREQUENCY (FREQUENCY_Code int PRIMARY KEY,
                        FREQUENCY_Desc varchar(50),
                        FREQUENCY_DatePart varchar(5),
                        FREQUENCY_Number int)

INSERT INTO FREQUENCY VALUES (1, 'Half Year', 'm', 6)
INSERT INTO FREQUENCY VALUES (2, 'Three Weeks', 'ww', 3)
INSERT INTO FREQUENCY VALUES (3, 'Quarterly', 'm', 3)

SELECT DATEADD(FREQUENCY_DatePart, FREQUENCY_Number, getDate())
FROM   FREQUENCY

The above SELECT statement returns the following error:

"'FREQUENCY_DatePart' is not a recognized dateadd option."

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Asked On
2009-11-03 at 03:56:37ID24866736
Tags

SQL

,

DATEADD

Topics

SQL Server 2005

,

SQL Server 2008

Participating Experts
2
Points
250
Comments
3

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Answers

 

by: angelIIIPosted on 2009-11-03 at 03:58:34ID: 25728033

indeed, you cannot use a column/variable for the first argument.
you will need a case statement, for example, for that.

 

by: vinurajrPosted on 2009-11-03 at 03:59:25ID: 25728040

make it as a dynamic query. and run

 

by: 3Si_pnewmanPosted on 2009-11-03 at 04:17:30ID: 31649346

It is strange how it works in MS Access and not SQL server, oh well. I turned it into a CASE statement and it works fine.

Thanks for your help.

20120131-EE-VQP-002

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