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Week number calculation

Apr 6, 2007

>>Script Language and Platform:

This script returns week numbers in current year.

Author: bobozlobo

SELECT ROWNUM week_in_year, TO_DATE(‘1.1.’ ||
TO_CHAR(SYSDATE,’yyyy’)) + ID, TO_DATE(‘1.1.’||
TO_CHAR(SYSDATE,’yyyy’)) + 6 + ID FROM
(
SELECT (a1.id + a0.id) ID
FROM
(
SELECT 0 id FROM dual UNION ALL
SELECT 1 FROM dual UNION ALL
SELECT 2 FROM dual UNION ALL
SELECT 3 FROM dual UNION ALL
SELECT 4 FROM dual UNION ALL
SELECT 5 FROM dual UNION ALL
SELECT 6 FROM dual UNION ALL
SELECT 7 FROM dual UNION ALL
SELECT 8 FROM dual UNION ALL
SELECT 9 FROM dual
) a0
CROSS JOIN (
SELECT 0 id FROM dual UNION ALL
SELECT 10 FROM dual UNION ALL
SELECT 20 FROM dual UNION ALL
SELECT 30 FROM dual UNION ALL
SELECT 40 FROM dual UNION ALL
SELECT 50 FROM dual UNION ALL
SELECT 60 FROM dual UNION ALL
SELECT 70 FROM dual UNION ALL
SELECT 80 FROM dual UNION ALL
SELECT 90 FROM dual
) a1
WHERE MOD((a1.id + a0.id),7) = 0
ORDER BY ID
)
WHERE ROWNUM < 53



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