Question

So I have an existing Mysql query that is pretty intense as-is which goes something like:

SELECT CURRENT.*, PROGRAMS.NAME 
FROM CURRENT 
LEFT JOIN PROGRAMS ON CURRENT.PID = PROGRAMS.ID 
ORDER BY PID ASC

Now, I want to use this query to do something else since I’m already hitting my database. I have a third table called “TIMEWINDOWS”, how would I use this query to return a set of tinyint (0 or 1) based on whether or not it’s between the Start_Time and End_Time along with all the other stuff already in my query?

Thanks a lot for the help.

The TimeWindows table has the following stuff:

ID               int(11) PK
PID              int(11)   <-- Can join on this from any of the other tables.
ALL_DAY          tinyint(1)
START_DATE       date
END_DATE         date
EARLIEST   time
LATEST     time
NOTICE       int(11)
LATEST  time
MAX int(11)
MIN int(11)
PROBABLE_START   time
PROBABLE_END     time

I want to check if it’s between start & end date, and return a bool if it is but I can’t seem to find a way to do so, can anyone help?

Answer 1

SELECT CURRENT.*, PROGRAMS.NAME, 
  CASE WHEN t.ID IS NULL THEN 0 ELSE 1 END AS BetweenStartEnd
FROM CURRENT 
  LEFT JOIN PROGRAMS ON CURRENT.PID = PROGRAMS.ID 
  LEFT JOIN TIMEWINDOWS t ON (t.PID = CURRENT.PID 
    AND DATE_FORMAT(NOW(), '%Y-%m-%d') > START_DATE 
    AND DATE_FORMAT(NOW(), '%Y-%m-%d') < END_DATE
  )
ORDER BY PID ASC