Why between for date is not returning data for this query ?

Question

Hello,
i have a table with this structure and i am writing this query for fetching some rows based on some condition , but this query is not returning any data . Can you please tell why ?
ID     DT
003     11/8/2011
002     10/8/2011
001     9/8/2011
And the query is :
SELECT * FROM TABLE_NAME WHERE DT BETWEEN TO_DATE('08/08/2011','dd/mm/yyyy') AND TO_DATE('12/08/2011','dd/mm/yyyy');
Edited by: bootstrap on Aug 13, 2011 7:10 AM

Answer 1

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but what is the problem with that, why that date is not matched when i am providing the date format ?Which part don't you understand? You did not use TO_DATE while inserting data and default date format was mm/dd/yyyy, right? Same default date format is used if you issue:
SELECT * FROM TABLE_NAME Your original post states the above select returns:
ID     DT
003     11/8/2011
002     10/8/2011
001     9/8/2011So dates you inserted are November 8, 2011, October 8 2011 and September 8 2011. Now TO_DATE('08/08/2011','dd/mm/yyyy') is August 8 2011 and TO_DATE('12/08/2011','dd/mm/yyyy') is August 12 2011. So obviously:
SELECT * FROM TABLE_NAME WHERE DT BETWEEN TO_DATE('08/08/2011','dd/mm/yyyy') AND TO_DATE('12/08/2011','dd/mm/yyyy');will not return any rows. Bottome line - never write code that uses implicit date conversions since your code becomes client NLS settings dependent and might work for one client and fail or produce wrong results for other client.
SY.