oracle timestamp

Hi experts,
I need to update a column in my table based on the system timestamp - 30 days.

the column is defined as varchar(50)
and when I select the values from the column I get the output as

2015-08-28 03:33:57
2015-09-21 02:25:17
2015-09-21 02:24:54

there is another column called 'compliant' which is defined as number and takes a binary value 1 or 0

I need to set this column to 1 if the timestamp in the varchar column is  current_date- 30

I tried this ---

update RTC_STG
set iscompliant = 1
where to_timestamp(lastupdatetime,'YYYY-MM-DD 24HH:MM:SS') = current_date - 30


and I get this error --

Error report:
SQL Error: ORA-01841: (full) year must be between -4713 and +9999, and not be 0
01841. 00000 -  "(full) year must be between -4713 and +9999, and not be 0"
*Cause:    Illegal year entered
*Action:   Input year in the specified range

how do I fix this issue??
smaligAsked:
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slightwv (䄆 Netminder) Commented:
First change:
to_timestamp(lastupdatetime,'YYYY-MM-DD 24HH:MM:SS')

to:
to_timestamp(lastupdatetime,'YYYY-MM-DD HH24:MM:SS')


If you still get an illegal year, you have bad data.

Second:
current_date - 30 means 30 days down to the SECOND you execute that statement.  If that is what you want, then great but I really doubt it.

Since your lastupdatetime has the time populated, what do you want to update on?
smaligAuthor Commented:
there are 2 columns in the table. lastupdatetime, iscompliant.

lastupdate time has the time populated. iscompliant column needs to be updated to 1 if the lastupdatetime values is <= current_date - 30
or updated to 0 if it is greater
slightwv (䄆 Netminder) Commented:
>>iscompliant column needs to be updated to 1 if the lastupdatetime values is <= current_date - 30

update RTC_STG  set iscompliant = case when to_timestamp(lastupdatetime,'YYYY-MM-DD HH24:MM:SS') <= current_date-30 then 1 else 0 end;

This still won't fix the data problem.  The error above is 99% a data issue.  This is why you should never store dates as a string.
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smaligAuthor Commented:
I am getting this error now --

Error report:
SQL Error: ORA-01841: (full) year must be between -4713 and +9999, and not be 0
01841. 00000 -  "(full) year must be between -4713 and +9999, and not be 0"
*Cause:    Illegal year entered
*Action:   Input year in the specified range
slightwv (䄆 Netminder) Commented:
>>I am getting this error now --

Bad data.

Here is a simple pl/sql loop to find it.  I set up my own table and data as an example.

drop table tab1 purge;
create table tab1(lastupdatetime varchar2(20));

insert into tab1 values('Hello');
insert into tab1 values('2015-08-28 03:33:57');
insert into tab1 values('2015-09-21 02:25:17');
insert into tab1 values('2015-09-21 02:24:54');
commit;

declare
	junk date;
begin
	for i in (select rowid, lastupdatetime from tab1) loop
		begin
			junk := to_date(i.lastupdatetime,'YYYY-MM-DD HH24:MI:SS');
			exception when others then
				dbms_output.put_line(i.lastupdatetime || ' is bad and the rowid is ' || i.rowid);
		end;
	end loop;
end;
/

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smaligAuthor Commented:
Awesome. was able to get the bad data out and update worked. Thanks a lot.
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