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53Variables.sql

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+#EXERCISE-1 
+drop procedure if exists emp_avg_salary_out;
+
+delimiter $$
+create procedure emp_avg_salary_out(in p_input_value int, out p_avg_salary decimal(10,2)) #out parameter-it will represent the variable containing the OUTPUT VALUE of the operation executed by the query of the stored procedure.
+begin
+select avg(s.salary) into p_avg_salary from employees e
+join salaries s on e.emp_no= s.emp_no
+where e.emp_no=p_input_value;
+end $$
+delimiter ;
+
+set @v_avg_salary= '0';
+call emp_avg_salary_out('10004', @v_avg_salary);
+select @v_avg_salary;
+#note:-The OUT parameter brings out a value from the operation, so to speak. The VARIABLES are able to store that value and thus can be used for further calculations.
+
+
+#EXERCISE-2
+drop procedure if exists emp_info;
+
+delimiter $$
+create procedure emp_info(in p_first_name varchar(40), in p_last_name varchar(40), out p_emp_no varchar(40))
+begin
+select e.emp_no into p_emp_no
+from employees e 
+where 
+e.first_name=p_first_name and 
+e.last_name= p_last_name;
+end $$
+delimiter ;
+
+set @v_emp_no= 0;
+call emp_info('aruna','journel',@v_emp_no);
+select @v_emp_no;
+
+#VARIABLE in SQL, does the same job as it is designed to do in any other programming language (stores a particular value). 
+#It is necessary to use VARIABLE if there is OUT parameter in the 'procedure' in order to store the OUT value or the returned value while calling the 'procedure'.
+
+