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Group into 4-week periods (in MySQL)
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| SET @day = CURDATE(); | |
| SELECT FLOOR(DATEDIFF(DATE_SUB(@day, INTERVAL DAYOFWEEK(@day) DAY), '1970-01-01') / 28) AS FWP | |
| -- 1970-01-04 is the start of FWP 0 | |
| SELECT FLOOR((TO_DAYS(@day) - TO_DAYS('1970-01-04') + 0.01) / 28) AS FWP |
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