Question

I’m writing some fields about some events in my database and I was thinking that I can do with:

rangeType (varchar) (may be: daily, weekly, monthly, yearly)
rangeStart (datetime)
rangeEnd (datetime)

I want to match a record when NOW() is in the range of time:

• when rangeType is 'yearly', if date of NOW() is between the month+days of rangeStart and rangeEnd

• when rangeType is 'monthly' if NOW() is between the days of rangeStart and rangeEnd

• when rangeType is 'weekly' if NOW() is….

• when rangeType is 'daily' if the time of NOW() is….

I think weekly needs a special treatment here, and the overall structure is not so flexible…

Then I need more fields! but I want something easy to read and mantain… what is the best way to do this with MySQL? Is there some function that allows me to do this without writing and mantain rows and rows of SQL?

What about the ISO8601 period specification?

Answer 1

Something like this?

SELECT ...
WHERE CASE rangeType
  WHEN 'daily'   THEN TIME(      NOW()) BETWEEN TIME(      rangeStart) AND TIME(      rangeEnd)
  WHEN 'weekly'  THEN DAYOFWEEK( NOW()) BETWEEN DAYOFWEEK( rangeStart) AND DAYOFWEEK( rangeEnd)
  WHEN 'monthly' THEN DAYOFMONTH(NOW()) BETWEEN DAYOFMONTH(rangeStart) AND DAYOFMONTH(rangeEnd)
  WHEN 'yearly'  THEN DAYOFYEAR( NOW()) BETWEEN DAYOFYEAR( rangeStart) AND DAYOFYEAR( rangeEnd)
END