Question

During my insertion of case when statement, the oracle will auto insert another ‘0’ behind any fixed number due to my case when.

For example:

INSERT INTO test
            (test_date,
             testno,
             hours)
 SELECT '20-OCT-2010',
       '1234',
       CASE
         WHEN Extract(DAY FROM( endtime - starttime )) >= 1 THEN (
         Extract(DAY FROM(
                         endtime - starttime ))
         * 24 + Extract
         (HOUR FROM(
       endtime - starttime
       )) )
         WHEN starttime IS NULL
              AND endtime IS NULL THEN 0
         ELSE ( Extract(HOUR FROM( endtime - starttime )) )
       END
       ||''
       || CASE
            WHEN endtime IS NULL
                 AND starttime IS NULL THEN 0
            ELSE Extract(MINUTE FROM ( endtime - starttime )) / 60
          END AS hours
FROM   testtime 

My results executed from the above statement:

Test_Date         TestNo           Hours
20-OCT-2010        1234            140

Expected results:

Test_Date         TestNo           Hours
20-OCT-2010        1234            14

My data type for hours is number (4,2)
My error is due to that if the starttime and endtime for minute is null, it will auto add an ‘0’ behind it. Even i change the ‘0’ to null, it will still add 0 behind.

May i know is there another way to place the ‘0’ value?

Thanks

Answer 1

Instead of concatenating number-of-hours and number-of-minutes,-divided-by-sixty, you should add them. For example, 3 hours and 0 minutes is 3 + 0 = 3 hours, not 3 || 0 = 30 hours.

In other words, change your ||''|| to +.