Question

Im running a sql query that is returning results between dates I have selected (2012-07-01 – 2012-08-01). I can tell from the values they are wrong though.

Im confused cause its not telling me I have a syntax error but the values returned are wrong.

The dates in my database are stored in the date column in the format YYYY-mm-dd.

SELECT `jockeys`.`JockeyInitials` AS `Initials`, `jockeys`.`JockeySurName` AS Lastname`,
       COUNT(`runs`.`JockeysID`) AS 'Rides', 
       COUNT(CASE
                  WHEN `runs`.`Finish` = 1 THEN 1 
                  ELSE NULL 
             END
             ) AS  `Wins`, 
        SUM(`runs`.`StakeWon`) AS 'Winnings'
  FROM runs
 INNER JOIN jockeys ON runs.JockeysID = jockeys.JockeysID
 INNER JOIN races ON runs.RacesID = races.RacesID
 WHERE `races`.`RaceDate` >= STR_TO_DATE('2012,07,01', '%Y,%m,%d')
   AND `races`.`RaceDate` <= STR_TO_DATE('2012,08,01', '%Y,%m,%d')
 GROUP BY `jockeys`.`JockeySurName` 
 ORDER BY `Wins` DESC`

Answer 1

It’s hard to guess what the problem is from your question.

Are you looking to summarize all the races in July and the races on the first of August? That’s a slightly strange date range.

You should try the following kind of date-range selection if you want to be more precise. You MUST use it if your races.RaceDate column is a DATETIME expression.

 WHERE `races`.`RaceDate` >= STR_TO_DATE('2012,07,01', '%Y,%m,%d')
   AND `races`.`RaceDate` <  STR_TO_DATE('2012,08,01', '%Y,%m,%d') + INTERVAL 1 DAY

This will pick up the July races and the races at any time on the first of August.

But, it’s possible you’re looking for just the July races. In that case you might try:

 WHERE `races`.`RaceDate` >= STR_TO_DATE('2012,07,01', '%Y,%m,%d')
   AND `races`.`RaceDate` <  STR_TO_DATE('2012,07,01', '%Y,%m,%d') + INTERVAL 1 MONTH

That will pick up everything from midnight July 1, inclusive, to midnight August 1 exclusive.

Also, you’re not using GROUP BY correctly. When you summarize, every column in your result set must either be a summary (SUM() or COUNT() or some other aggregate function) or mentioned in your GROUP BY clause. Some DBMSs enforce this. MySQL just rolls with it and gives strange results. Try this expression.

GROUP BY `jockeys`.`JockeyInitials`,`jockeys`.`JockeySurName`