Added queries for P5. Thanks to Macho, again.

Practical/Practical Exam/PL-SQL/P5 - PL-SQL Block.md

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+# P5 - PL-SQL Block
+
+**Problem Statement:** Write a PL/SQL Block to increase the salary of employees by 10% of existing salary, who are having salary less than
+average salary of organization, whenever such salary updates take place, a record for same is maintained in the
+increment_salary table.
+emp(emp_no, salary)
+increment_salary(emp_no, salary)
+
+---
+
+## Creating tables:
+```sql
+CREATE TABLE emp(
+    emp_no NUMBER(14),
+    salary NUMBER(14)
+);
+
+CREATE table increment_salary(
+    emp_no NUMBER(14),
+    salary NUMBER(14)
+);
+
+```
+
+## Inserting values:
+```sql
+INSERT INTO emp VALUES (1, 1000);
+INSERT INTO emp VALUES (2, 8000);
+INSERT INTO emp VALUES (3, 2000);
+INSERT INTO emp VALUES (4, 5000);
+INSERT INTO emp VALUES (5, 7000);
+
+```
+
+## Procedure
+```sql
+DECLARE
+    avg_salary NUMBER(14, 4);
+BEGIN
+    SELECT AVG(salary) INTO avg_salary FROM emp;
+    FOR emp_record IN (select emp_no, salary FROM emp WHERE salary < avg_salary)
+    LOOP
+        insert into increment_salary(emp_no, salary) values (emp_record.emp_no, emp_record.salary);
+        UPDATE emp SET salary = emp_record.salary * 1.10 WHERE emp_no = emp_record.emp_no;
+    END LOOP;
+EXCEPTION
+    WHEN OTHERS THEN
+        DBMS_OUTPUT.PUT_LINE('Error: ' || SQLERRM);
+end;
+/
+
+```
+
+<details>
+  <summary><strong>OUTPUT</strong>: After PL/SQL Block:</summary>
+  emp:<br>
+  EMP_NO	SALARY<br>
+  1	1100<br>
+  2	8000<br>
+  3	2200<br>
+  4	5000<br>
+  5	7000<br>
+  <br>
+  increment_emp:<br>
+  EMP_NO	SALARY<br>
+  1	1000<br>
+  3	2000<br>
+</details>
+
+---