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Date Comparison


Posted Date: 12 Sep 2008    Resource Type: Code Snippets    Category: SQL
Posted By: Prafulla S Shimpi       Member Level: Gold
Rating:     Points: 5



In a number of SQL statements that it is regular practice here to do the following type of date comparison:



SELECT *

FROM   TABLE

WHERE  DDATE = ’01 JAN 2008’;


This is considered in bad practice in the Oracle world.

The above query should be rewritten like this:

SELECT *

FROM   TABLE

WHERE  DDATE = TO_DATE (’01 JAN 2008’, ‘DD MON YYYY’);


Aside from the reasons listed below it also gives the Optimiser a better understanding of the data.



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