Possible Answers

1. mysql> select SUM(age) from employee_data;
   
   +----------+
   | SUM(age) |
   +----------+
   |      664 |
   +----------+
   1 row in set (0.00 sec)
   
   

2. mysql> select SUM(yos) from employee_data;
   
   +----------+
   | SUM(yos) |
   +----------+
   |       56 |
   +----------+
   1 row in set (0.00 sec)
   
   

3. mysql> select SUM(salary), AVG(age)    
       -> from employee_data where
       -> title = 'Programmer';
       
   +-------------+----------+
   | SUM(salary) | AVG(age) |
   +-------------+----------+
   |      300000 |  30.5000 |
   +-------------+----------+
   1 row in set (0.00 sec)
   
   

4. This displays the percentage of salary that is given as perks to the employees of Bignet.

   mysql> select (SUM(perks)/SUM(salary) * 100)                                     
       -> from employee_data;
       
   +--------------------------------+
   | (SUM(perks)/SUM(salary) * 100) |
   +--------------------------------+
   |                          19.53 |
   +--------------------------------+
   1 row in set (0.00 sec)