Showing MySQL rows in a PHP file

[KingPuyol]

Thanks and can you please explain what is $i and can you also tell me:
1- How can I limit the number of rows to show, for example: showing the last 20 rows.
2- Paginating rows, for example, showing first 20 rows and then the next 20 in the other. etc..
3- If one of the fields that I have is empty, for example let's say the table is called table and the column which is going to be empty is called game. How can I select the empty one:
Here's the table:

id----  player      ---- game
1 ----  Andrew    ---- 5
2 ----  Someone  ---- 3
3 ----  King          ---- NULL*
4 ----  MOnkey    ---- NULL

I meant by NULL that it's EMPTY, nothing is in it, so if I wanted to arrange all this in Ascending Order by ID and I want it to select the FIRST row where the game field is NULL.