将oracle列作为时间戳返回

Question

I'm in coldfusion working with data from an sql table, and using a query of queries to join the sql data to some data from an oracle database. Unfortunately, I need to order them by date, and the oracle table has two columns - DRWR_DATE which is of type DATE and TIME which is of type VARCHAR2. The two columns put into a string read 17-JUN-03 16:35:18 or something similar. I need to return these two columns as a TIMESTAMP so I can use query of queries to sort them.

Also, I think I read that a date column holds the time in Oracle anyway? I don't have much experience with Oracle so I am unsure how best to do this.

Answer 1

Try this:

SELECT  to_timestamp(
              to_char( drwr_date,'dd-mon-yy') ||' '|| time
              , 'dd-mon-yy hh24:mi:ss'
        ) 
FROM   your_table

Answer 2

Try using TO_TIMESTAMP function:

SELECT TO_TIMESTAMP('17-JUN-03 16:35:18', 'DD-MON-RR HH24:MI:SS') 
  FROM DUAL;

Answer 3

you can try converting the column to date as the following:

TO_DATE(column,'DD-MON-YY HH24:MI:SS')

The first parameter takes your column and the second parameter specifies the date format that is used

Answer 4

If all you have to do is order by date, all you need is an order by clause.

order by drwr_date, time

You don't have to cast these to anything, unless you need to do so for another reason. Remember that a date datatype is essentially a floating point number. This, "17-JUN-03" is simply how your client is displaying it.