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Questions and Answers
What will be the output if v_grade is 'B'?
What will be the output if v_grade is 'B'?
When is the basic loop used in PL/SQL?
When is the basic loop used in PL/SQL?
What happens each time the flow of execution reaches the END LOOP statement in a basic loop?
What happens each time the flow of execution reaches the END LOOP statement in a basic loop?
What type of loops does PL/SQL provide?
What type of loops does PL/SQL provide?
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What is the purpose of the 'OPEN cur_countries(145)' statement in the given PL/SQL code?
What is the purpose of the 'OPEN cur_countries(145)' statement in the given PL/SQL code?
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What does the 'EXIT WHEN cur_emps%NOTFOUND' statement do in the given PL/SQL code?
What does the 'EXIT WHEN cur_emps%NOTFOUND' statement do in the given PL/SQL code?
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What is the purpose of 'FOR v_emp_record IN cur_emps(10) LOOP' in the given PL/SQL code?
What is the purpose of 'FOR v_emp_record IN cur_emps(10) LOOP' in the given PL/SQL code?
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What does the 'WHERE region_id = p_region_id OR population > p_population' clause in the given PL/SQL code represent?
What does the 'WHERE region_id = p_region_id OR population > p_population' clause in the given PL/SQL code represent?
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Where should the EXIT condition be placed in a basic loop to ensure the other statements in the loop do not execute?
Where should the EXIT condition be placed in a basic loop to ensure the other statements in the loop do not execute?
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Which statement is the correct way to end a basic loop?
Which statement is the correct way to end a basic loop?
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When is the condition evaluated in a WHILE loop?
When is the condition evaluated in a WHILE loop?
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What type of variable or expression is used as the condition in a WHILE loop?
What type of variable or expression is used as the condition in a WHILE loop?
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Study Notes
Conditions and Loops in PL/SQL
- If
v_gradeis '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_empsis empty. - The
%NOTFOUNDattribute 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_empswith 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.
Studying That Suits You
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Description
Test your knowledge of the Oracle PL/SQL case statement with this quiz. Determine the output based on the given PL/SQL code snippet.
