Getting timestamp using MySQL

Depends on which kind you're looking for.

The current integer Unix Timestamp (1350517005) can be retrieved like so:

SELECT UNIX_TIMESTAMP();

MySQL often displays timestamps as date/time strings. To get one of those, these are your basic options (from the MySQL Date & Time reference):

SELECT CURRENT_TIMESTAMP;
SELECT CURRENT_TIMESTAMP();
SELECT NOW();

CURRENT_TIMESTAMP is standard SQL and works on SQL server, Oracle, MySQL, etc. You should try to keep to the standard as much as you can.