MySQL SUM

[b3wk]

Hello!

 

I have one problem.

On MySQL database I have table with name 'visitors' and there I have two column...

ID    Visitors

1      5690

2      5434

3      234

...      ...

x      45455

y      45858

 

How can I sum last two rows (x + y)?

 

I use

$izbira = "SELECT SUM(visitors) FROM visitors ORDER BY id DESC LIMIT 2;

but this function sum all rows... 

 

Thank you for help!

...and sorry 4 my english

[Mchl]

SELECT SUM(sq.visitors) AS sumVisitors FROM (SELECT visitors FROM visitors ORDER BY id DESC LIMIT 2) AS sq;