Oracle PL/SQL Case Statement Quiz

Conditions and Loops in PL/SQL

• If v_grade is 'B', the output will be dependent on the specific code being executed.

Basic Loop

• The basic loop is used in PL/SQL when there is no condition to be checked before or after the loop execution.
• Each time the flow of execution reaches the END LOOP statement in a basic loop, the control goes back to the beginning of the loop and the statements are executed again.

Types of Loops

• PL/SQL provides two types of loops: basic loop and WHILE loop.

Cursors

• The 'OPEN cur_countries(145)' statement is used to open a cursor with the specified parameter.
• The purpose of opening a cursor is to execute a query and retrieve the results.

Exit Statement

• The 'EXIT WHEN cur_emps%NOTFOUND' statement is used to exit the loop when the cursor cur_emps is empty.
• The %NOTFOUND attribute is used to check if the cursor has fetched all the rows.

FOR Loop

• The 'FOR v_emp_record IN cur_emps(10) LOOP' statement is used to iterate over the cursor cur_emps with a maximum of 10 records.

WHERE Clause

• The 'WHERE region_id = p_region_id OR population > p_population' clause is used to filter the records based on the specified conditions.

Basic Loop Exit Condition

• The EXIT condition should be placed inside the loop body to ensure that the other statements in the loop do not execute after the exit condition is met.

Ending a Basic Loop

• The correct way to end a basic loop is to use the EXIT statement.

WHILE Loop

• In a WHILE loop, the condition is evaluated at the beginning of each iteration.
• A BOOLEAN variable or expression is used as the condition in a WHILE loop.