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Increase ID by one every 7 days

Thread began 5/19/2010 10:51 am by John Langer | Last modified 6/21/2010 8:22 am by John Langer | 3842 views | 42 replies

CraigRBeta Tester

still thinking out loud here.

if we were to calculate datediff(todays date, fixed start date) and divide by 7, then we can calculate number of weeks since a fixed point in time.

taking a mod(20) of this value would always provide a number between 1 and 20, so this value can be used to select the 'active' row.

Using this method, we would always be in sequence.

does this seem plausible ?


If so, here is my rough and ready SQL...

SELECT * FROM toptenlist
WHERE topTenListID = (mod(round((datediff(curdate(), '2008-10-10')/7),0),3)+1)

2008-10-10 is just an arbitrary date
+1 is required at the end in case the modulus returns 0

(in the example above, i used a modulus of 3 (in red), but this number should be the same as the number of rows in the table.

Feel free to point out the errors in my logic !! :-)

It kept my brain going anyway.

Hope this helps

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