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MySQL for race results

I want to create a MySQL database to hold the results of a race that will take place annually.

The details I want in the table are:-
surname, firstname, racenumber, finishtime, year

Each year, runners will be issued a unique race (bib) number. However, the same set of numbers will be used each year.

What is the best way of keeping the racenumber field unique for each year? (i.e. racenumber must be a unique number between 1 and 200 for year 2015, and then again must be a unique number between 1 and 200 for year 2016 etc)
Chris Millard
Chris Millard
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2 Solutions
What is the app you use to access the mysql, that is where you would randomize the assignment.
Presumably you a second table that has
Runnerid from the main runner info table
Year of the run
Runner number
All three will be added as a unique index. This will insure that there will not be two runner ers in a year with the same number enforced by the database.
Runner table
Year and number table.

Alternatively, you can assign a number to the individual in the order they are signed in.
That will insure uniqueness as well. First person to check in/sign in or be checked in/signed in will be 1 and the last will be 200
You could alternate the order year to year if you want, start from one and increment or start from 200 and decrement by changing the increment for the table.
The runner, year, race number table can include the results for the race, if you need to keep track of the time in various locations, another table could do that.
Chris MillardAuthor Commented:
Thanks for the ideas - I haven't made a decision yet, as I have just over a year in order to finalise everything.
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