How to write a query use between two months

Hello,
I have two views v1 and v2. Both have two columns c1 and c2: c1 with mon-yyyy format, c2 is a number. I am writing a query like this;
select v1.c2, v2.c2 from v1, v2
where v1.c1 = v2.c1 and v1.c1 between to_date('Jan-2011','mon-yyyy')
and to_date('Dec-2011','mon-yyyy')
i got: ORA-01858: a non-numeric character was found where a numeric was expected
V1 and V2 value are like these:
Mon-2011 89
Feb-2011 33
Mar-2011 45
Apr-2011 98
How to make it work.
Thanks for your help.
Jen

Hello Jen Hu,
Try this:
with t as ( select 'feb-2011' as c1, 33 as nr from dual union
select 'mar-2011',45 from dual union
select 'apr-2011',98 from dual union
select 'jun-2011',86 from dual union
select 'jul-2011',78 from dual union
select 'aug-2011',87 from dual union
select 'sep-2011',68 from dual union
select 'oct-2011',56 from dual union
select 'nov-2011',68 from dual union
select 'dec-2011',55 from dual union
select 'jan-2012',54 from dual
) SELECT * FROM T
where to_date(c1,'mon-yyyy') between to_date('aug-2011','mon-yyyy') and to_date('dec-2011','mon-yyyy');@Tauceef:
>
Tauceef wrote:
You have to store full date, the conversion you are doing to_date('jan-2011','mon-yyyy') is not at all accepted, this is where you are getting that error.
>
Why not? Have you tried:
select to_date('jan-2011','mon-yyyy') from dual;Once you convert the character string into date it is easier to compare!
I agree with @clcarter's point:
>
Firstly, if you want to compare dates, use a DATE datatype, not varchar2. If the varchar2 has invalid dates you'll have all sorts of trouble. 'Feb-31-2011' is a perfectly valid string. But its not a date.
>
But if you have better mechanism of valid string input as in here:
http://apex-plugin.com/oracle-apex-plugins/item-plugin/month-picker_148.html
then problems of invalid string input are minimized!
Hope it helps!
Regards,
Kiran

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