Internal Table Record Availability Checking

Dear Sir,

We are using LOOP command for reading the records of an Internal Table . But before entering into the Loop , we want to check that incase Records in the Internal Table are more than 0 , only then it should go for Loop , else it should not go for Loop .

So how can we check that whether Internal Table has Records contained in it or not .

Pl guide us .

Regards

B V Mittal