Date stored in Char(11)

helloc++ · #1 (**permalink**) 03-16-09, 10:50

Hi all,

Unfortunatly in my application we are using Char(11) to store date in database , instead of using datatype "DATE " .

Here goes exactly how my table look like.

loandate ------- in dd/mm/yyyy
==========
'09/03/2009'
'10/03/2009'
'11/03/2009'
'12/03/2009'
'13/03/2009'

Now how can i query the records which are in between 10/03/2009 and 12/03/2009

Can i query this as follows ( But no result ....

)

Code:

select CONCAT(RIGHT(loandate,4),SUBSTRING(loandate,4,2),LEFT(loandate,2)) as loandate
FROM mytable
WHERE loandate >= '2009/03/10'
and  loandate <= '2009/03/12'

Thanks in advance

gvee · #2 (**permalink**) 03-16-09, 11:03

You really need to change the datatype to the correct one.
Data Types -- The Easiest Part of Database Design

mike_bike_kite · #3 (**permalink**) 03-16-09, 11:16

Quote:

how can i query the records which are in between 10/03/2009 and 12/03/2009

It's definitely best to change the data types if you can. If you're afraid of having to rewrite all the code then you could also add an extra field to the existing table and set the proper date there. If you don't want to alter the existing database at all then the following should work but it won't be efficient at:
Code:
select STR_TO_DATE(loandate,'%Y%m%d') as loandate
FROM   mytable
WHERE  STR_TO_DATE(loandate,'%d/%m/%Y') >= '2009-03-10'
       and  STR_TO_DATE(loandate,'%d/%m/%Y') <= '2009-03-12'

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