DECLARE
YEAR NUMBER;
BEGIN
DELETE FROM HISTORY_SUM;
INSERT INTO HISTORY_SUM (YEAR)
Select DISTINCT(TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY'))) as YEAR from HISTORY
ORDER BY YEAR;
FOR x IN (Select * from HISTORY_SUM) LOOP
UPDATE HISTORY_SUM
SET JAN = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 1)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET FEB = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 2)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET MAR = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 3)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET APR = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 4)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET MAY = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 5)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET JUN = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 6)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET JUL = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 7)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET AUG = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 8)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET SEP = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 9)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET OCT = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 10)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET NOV = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 11)
WHERE YEAR = x.YEAR;
UPDATE HISTORY_SUM
SET DEC = (Select SUM(TOTAL_$) from HISTORY c
WHERE TO_NUMBER(TO_CHAR(VISIT_DATE, 'YYYY')) = YEAR AND TO_NUMBER(TO_CHAR(VISIT_DATE, 'MM')) = 12)
WHERE YEAR = x.YEAR;
END LOOP;
COMMIT;
END;
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