Given the following relational schema below, write an appropriate SQL expression

Question

Given the following relational schema below, write an appropriate SQL expressions to satisfy each query Employee (Emp No, Name, Salary) Flight (Num, Orign, Dest, Dep_Time, Arr_Time) Departure (Dep_Date, Num) Can_Fly (Emp_No, Model_No) Find out the names of employees who earn more than $120,000 Salary. Find out the average employee salary. Find out all the flight numbers that fly from JFK to LAX with arrive time in between 1 pm to 6pm. (13:00 to 18:00) Find out all the employee names who can fly B-747.

Explanation / Answer

1. select name from employee where salary>120000;

here we are selecting the names grater then salary 120000

2. select avg(salary) from employee;

The avg() give the average salary from employee

3.select num from flight where origin="JFK" and dest="LAX" and arr_time between '13:00' and '18:00';

in the abow query we are giving three conditons and this conditons are satisfing rows will return

4, select emp_name from employee inner join can_fly on emp_name.emp_no=can_fly.emp_no where can_fly.model_no="B-747";

here we are using inner join to write the query we are joining two tables and given one condion on the joined table if the codion satisfing rows wil return

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