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I've been searching for a MySQL tips and noticed there is no such topics on this forum. So let's fix this little problem. I want to know more about optimising MySQL queries and how to interract with MySQL correctly, I am newbie in that. I learned that putting queries in the loop it's too performance-expensive, wrong, and very big chance it'll freeze your server for uncertain time. So if I want to get information from DB for a many players, better to make it using only 1 query. Example: "SELECT * FROM race_stats WHERE playerID IN(??)" Where "??" = table with logged in players. But, what if I want to update information for a many players at the same time? How such query should look like? For 1 player it looks like this: "UPDATE race_stats SET id1 = id1 + ?, id2 = id2 + ?, id3 = id3 + ?, id4 = id4 + ?, id5 = id5 + ? WHERE playerID = ?" But how to make the same for all players? Put query in the loop will be too performance-expensive I guess and will create laggs. P.S. Maybe for such thing as player stats better to learn MySQL procuderes and create procedure for this, I am newbie, just asking. Don't even know what is procedures exactly, just heard about it.
