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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'?
- Excellent
- No such grade
- Error
- Good (correct)
When is the basic loop used in PL/SQL?
When is the basic loop used in PL/SQL?
- When the loop must execute at least once (correct)
- When the loop is based on a condition
- When the loop is based on a counter
- When the loop needs to execute a specific number of times
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?
- Control is passed to the corresponding LOOP statement (correct)
- The loop terminates immediately
- The loop checks for conditions
- An error is thrown
What type of loops does PL/SQL provide?
What type of loops does PL/SQL provide?
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?
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?
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?
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?
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?
Which statement is the correct way to end a basic loop?
Which statement is the correct way to end a basic loop?
When is the condition evaluated in a WHILE loop?
When is the condition evaluated in a WHILE loop?
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?
Flashcards
Output for v_grade 'B'
Output for v_grade 'B'
The output will be 'Good'.
Basic loop usage in PL/SQL
Basic loop usage in PL/SQL
A basic loop is used when it must execute at least once.
END LOOP function
END LOOP function
Control is passed to the corresponding LOOP statement at END LOOP.
Types of loops in PL/SQL
Types of loops in PL/SQL
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OPEN cur_countries statement
OPEN cur_countries statement
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EXIT WHEN cur_emps%NOTFOUND
EXIT WHEN cur_emps%NOTFOUND
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FOR v_emp_record IN cur_emps
FOR v_emp_record IN cur_emps
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WHERE clause purpose
WHERE clause purpose
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EXIT condition in basic loop
EXIT condition in basic loop
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Ending a basic loop
Ending a basic loop
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WHILE loop condition evaluation
WHILE loop condition evaluation
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Condition type in WHILE loop
Condition type in 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.
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