function not found – 2 questions

TimRaz
pts.
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IBM DB2
SQL
I wrote a function to change a date in character *USA format to *ISO character format. There is a lot of data to insert and all the dates are in *USA format rather than ISO format. The function is created but running the statement, I am told the function does not exist. Why isn't the function found? (Question 1) Here's the code. DROP FUNCTION TIMR.U2O; CREATE FUNCTION TIMR.U2O(INUSA CHAR(10) ) RETURNS CHAR(10 ) LANGUAGE SQL SPECIFIC USA2ISO BEGIN DECLARE OUTISO CHAR(10); SET OUTISO = CONCAT(SUBSTR(INUSA, 7,4), '-') ; SET OUTISO = CONCAT(OUTISO, SUBSTR(INUSA, 1,5)) ; RETURN OUTISO ; END ; SELECT TIMR.U2O('12-31-1931') AS BDATE FROM TIMR.DISMSTP; I looked for an existing function that would do this but could find none. Is there a shorter way? (Question 2)
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(1) I’m not sure what the SPECIFIC clause does. You might want to try removing that.
(2) You can do this all at once: RETURN SUBSTR(input,4,3)||SUBSTR(input,1,3)||SUBSTR(input,7)
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  • Sequential
    I would suggest changing this from SELECT TIMR.U2O('12-31-1931') AS BDATE FROM TIMR.DISMSTP; to SELECT TIMR.U2O('12-31-1931') AS BDATE FROM dual; Or you might want to check out this alter session set NLS_DATE_FORMAT='my_format'; But in the off chance you need the function to work. CREATE OR REPLACE FUNCTION U2O(INUSA CHAR) RETURN CHAR IS OUTISO VARCHAR2(30); BEGIN OUTISO := CONCAT(SUBSTR(INUSA, 7,4), '-') ; OUTISO := CONCAT(OUTISO, SUBSTR(INUSA, 1,5)) ; RETURN OUTISO; END; / SELECT U2O('12-31-1931') AS BDATE FROM dual;
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