SQL DML Statement Set 1

Which of the following  are DML statements ?

What is the correct form of select all record from Emp table ?

If we want to select ' Salary '  from emp table , which should be display as Sal, what is the correct statement ?

Which one is correct statement to get the number of record in emp ?

Select   *  from Emp, Dept ;

Is it possible to select records of both table like this?

Emp table is having three column Ename,Eno and Age.

Which are the correct insert statements to insert value ?

Inserted value of a table can be roll back .

Can we insert multiple values to a table at a time ?

Which of the following is correct  update statement ?

Can we update more than one table value at a single time ?