Collating Values from database fields

Hi, I'm building a site for my rugby club and I want to present players' data ie: number of appearances, points scored and so on. I have three tables in my database: a table of tournaments (date, location, opposition, etc), a table of players (name, contact details, position, etc) and a table of appearances (fixtureID, playerID, tries scored, penalties scored, cautions etc. When a player is selected from a drop-down list, their data will appear in a table by drawing from the 'appearances' table based on the player's ID thus: Player: Matt MacLeod --------------------- Tournament 1 / 19/01/2003 / 2 tries / 0 pens / 0 cautions Tournament 2 / 24/03/2003 / 4 tries / 3 pens / 1 caution Tournament 3 / 27/03/2003 / 0 tries / 3 pens / 0 cautions I then want to print the player's totals thus: 3 tournaments / 6 tries / 6 pens / 1 caution This is where I get stuck. I know how to display the data on a tournament by tournament bais, and get PHP to build an additional table row for each appearance by the player, but I am unsure of how to add up the columns and print the totals at the end of the table. Any help would be greatly appreciated. Thanks, Matt