How to Convert Varchar2 to Date format(Timestamp)

I have a date saved in varchar2 column.
how can I convert the values into date(including Time stamp), so I can use the date to compare data.
Ex: I have the value '20-03-2007 05:31:29', but this value is saved as varchar2.
how can I take from this value the date '20-03-2007 05:31:29' as date format because later i need that date completely to add days, hours and minutes?

SQL> create table dd (a varchar2(15));
Table created.
SQL>
SQL>
SQL> insert into dd values (sysdate);
1 row created.
SQL> insert into dd values (sysdate);
1 row created.
SQL> insert into dd values (sysdate);
1 row created.
SQL> insert into dd values (sysdate);
1 row created.
SQL> insert into dd values (sysdate);
1 row created.
SQL> insert into dd values (sysdate);
1 row created.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> select * from dd;
A
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
6 rows selected.
SQL>
SQL>
SQL> select to_date(a,'dd-mon-yyyy') from dd;
TO_DATE(A
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
01-OCT-12
6 rows selected.
SQL> select to_timestamp(to_date(a,'dd-mon-yyyy'),'dd mon yy hh24.mi.ss' ) from dd;
TO_TIMESTAMP(TO_DATE(A,'DD-MON-YYYY'),'DDMONYYHH24.MI.SS')
01-OCT-12 12.00.00 AM
01-OCT-12 12.00.00 AM
01-OCT-12 12.00.00 AM
01-OCT-12 12.00.00 AM
01-OCT-12 12.00.00 AM
01-OCT-12 12.00.00 AM
6 rows selected.
SQL>
that's it......

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Hi,
housetiger77 wrote:
I've converted date formats many times, but for some reason I'm getting an invalid number error when trying to convert a varchar2 column. I've tried the to_char and to_date function and I get the same result. The column is a date and it is formatted as DD-MON-YYYY,If the column is a DATE, then it has the same format that all DATEs have, which is nothing like 'DD-MON-YYYY'. Formats like that only apply to strings.
Conversely, if it is formatted as 'DD-MON-YYY', then it is a string, not a DATE.
but I want to change it to MM/DD/YYYY. My query is below:
select to_date('fccpdate','MM/DD/YYYY')
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When I try to_date I get this:
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select TO_char('fccpdate', 'DD-MON-YYYY') from cc_class_scmast_v where fccpdate IS NOT NULL
Error report:
SQL Error: ORA-01722: invalid number
01722. 00000 - "invalid number"
*Cause:
*Action:
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If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say which version of Oracle you're using.
See the forum FAQ {message:id=9360002}

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buenos tardes
ÇÇÇ

How to Convert Varchar2 to Date format(Timestamp)

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