SQL Date Range Filtering: When to Use BETWEEN vs. >= and

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SQL: BETWEEN vs. "="

In SQL Server 2000 and 2005, the BETWEEN operator and the combination of "" operators for date range filtering present distinct characteristics.

BETWEEN Operator

The BETWEEN operator is a shorthand syntax that simplifies the expression of a range comparison. For instance, the following two queries filter rows based on the same event date range:

Query 1:

SELECT EventId, EventName
FROM EventMaster
WHERE EventDate BETWEEN '10/15/2009' AND '10/18/2009'

Query 2:

SELECT EventId, EventName
FROM EventMaster
WHERE EventDate >= '10/15/2009' AND EventDate <p>Despite their syntactic differences, both queries yield identical results, highlighting that BETWEEN is merely an abbreviation of the longer syntax.</p><p></p><h3 id="Situational-Usage">Situational Usage</h3><p>The choice between using BETWEEN and the "" operators depends on the specific scenario:</p>

• Use BETWEEN: When both endpoints of the range need to be included.
• Use "": When one or both endpoints need to be excluded. For example:

SELECT EventId, EventName
FROM EventMaster
WHERE EventDate >= '10/15/2009' AND EventDate <p></p><h3 id="Handling-DATETIME">Handling DATETIME</h3><p>When working with DATETIME data types (as opposed to DATE), it's crucial to note that the BETWEEN operator considers the time component as well. This means that the following query:</p><pre class="brush:php;toolbar:false">EventDate BETWEEN '10/15/2009' AND '10/18/2009'

Will effectively filter rows for the range from '2009-10-15 00:00' to '2009-10-18 00:00', potentially excluding rows on October 18, 2009.

To include all rows for October 18, 2009, the query should be modified:

EventDate BETWEEN '2009-10-15 00:00' AND '2009-10-18 23:59:59'

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