How to create fast database queries

Archive for October 5th, 2009

Date range with possible NULL values

with 2 comments

From Stack Overflow:

Using SQL Server 2008.

I have a stored proc which has start and end date as input parameters for date range.

Looking for a single SQL query which has a BETWEEN predicate on start and end date in the WHERE clause which can handle both cases where the dates are either both NULL or both have values.

This can be done by writing an IS NULL check in the expression, like this:

WHERE   (@startDate IS NULL OR date >= @startDate)
AND (@endDate IS NULL OR date >= @endDate)

or by using a COALESCE on the value of the date itself (so that the range always matches):

WHERE   date BETWEEN ISNULL(@startDate, date) AND ISNULL(@endDate, date)

However, none of these conditions uses an index on date efficiently.

Let's create a sample table ans see:
Read the rest of this entry »

Written by Quassnoi

October 5th, 2009 at 11:00 pm

Posted in SQL Server