Complete confusion over date timestamp functions

Question

hi all
i am completely confused with date/timestamp in oracle as i m moving from mssql to oracle
what i am trying to do is :
i have a table called rawcdr
which has a date field in which i imported data from MSSql
IT CONTAINS date and time
now i have another table called processedcdr in which i put my processed data
only those records from rawcdr are selected which have calltime greater than the max calltime from processed table
in srt
something like
select * from rawcdr where calltime>max(calltime) from processedcdr
when i try doing it in my procedure it doesn match proper records
instead gives improper results where records time is not what is expected
please help me out
i m stucked up

Answer 1

hi
Dmytro
this is the schema of my tables
rawcdr (srcip,callto, duration,calltime,....)
sample data(202.1.1.1,00919869356549,50,01-JAN-05 3:00:00 AM)
in this calltime is date field whereas rest are varchar
testcdr(accid,country,cost,calltime...........)
sample data (invoip001,india,.0015,01-JAN-05 2:50:00 AM)
Now suppose this is the last record or the max calltime record in the processedcdr
than i want the records greater than this time from rawcdr
ie between 2:50 and 3:00
for that i wrote a block
declare
lastcall varchar2;
total number;
begin
select max(calltime) into lastcall from processedcdr;
select count(*) from rawcdr into number where calltime>lastcall;
end;
i tried many combinations of to_char and date func but didnt get any result
thanks 4 d help