Question

I have a table that lists Dates as 110427 in Date col.
I Have a days col, which is days form today.
This sql gets all my dates:

 SELECT DISTINCT date FROM test.op;

This Sql gets days from today:

SELECT TO_DAYS('20110430') -  TO_DAYS(NOW());

How do I loop an update?
Where result would

     Date    Days
    110430   3
    110530   33

Would use an if or case?

Answer 1

How about this?

UPDATE   MyTable
SET      Days = TO_DAYS(date) - TO_DAYS(NOW());

This would update each row’s Days column to have the value from the the row’s date column run through your subtraction.