Combining DD-MON field with YYYY field from GL table

Question

I am running into issues with GL_Cancelled_Date which is displaying the wrong 4 digit year. The GL_Encumbered_Date for these rows is correct and I am looking at ways to combine these fields to output the correct full DD-MON-YYYY date. The below code displays all of the bad rows of data and the last two coloumns display the correct DD-MON and YYYY dates. But I am unsure of how to combine the DD-MON from GL_Cancelled_Date with the YYYY from GL_Encumbered_Date.
I have written out:
SELECT
      PRH.SEGMENT1,
      prd.GL_ENCUMBERED_DATE,
      TO_CHAR(PRD.GL_ENCUMBERED_DATE,'YYYY'),
      PRD.GL_CANCELLED_DATE,
      TO_CHAR(PRD.GL_CANCELLED_DATE, 'DD-MON-YYYY'),
      to_char(prd.gl_cancelled_date,'YYYY'),
      to_char(prd.gl_cancelled_date,'DD-MON-') as date_day_month,
      to_char(prd.gl_encumbered_date,'YYYY') as date_year
FROM
     PO_REQUISITION_HEADERS_ALL PRH,
     PO_REQUISITION_LINES_ALL   PRL,
     PO_REQ_DISTRIBUTIONS_ALL   PRD
WHERE
     PRH.REQUISITION_HEADER_ID = PRL.REQUISITION_HEADER_ID
      AND   PRL.REQUISITION_LINE_ID   = PRD.REQUISITION_LINE_ID
      AND   PRD.GL_CANCELLED_DATE IS NOT NULL
      AND   to_char(PRD.GL_CANCELLED_DATE,'YYYY') LIKE '00%';

Answer 1

Hi,
Here's one way to correct the table:
UPDATE  po_req_distributions_all
SET     gl_cancelled_date = ADD_MONTHS ( gl_cancelled_date
                                       , 12 * ( EXTRACT (YEAR FROM gl_encumbered_date)
                                              - EXTRACT (YEAR FROM gl_cancelled_date)
WHERE   EXTRACT (YEAR FROM gl_encumbered_date)
    <>  EXTRACT (YEAR FROM gl_cancelled_date)
When this finishes, gl_cancelled_date will always have the same year as gl_encumbered_date, but hte original months, days, hours, minutes and seconds of gl_cancelled_date will be unchanged.  (Exception: If the original gl_cancelled_date is February 29, and gl_encumbered_date is NOT in a leap year, then the day will be changed to 28, since there is no February 29 in the correct year.  If the original gl_cancelled_date is February 28, and gl_encumbered_date IS in a leap year, then the day will be changed to 29.  This can be fixed if it's a problem.)
I hope this answers your question.
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