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Oracle Exams Training Create tablespaces

You need to update employee salaries if the salary of an
employee is less than 1000. The salary needs to be incremented by 10%. Use
SQL*Plus substitution variable to accept the employee number. Which PL/SQL
block successfully updates the salaries?

A. Declare
V_sal emp.sal % TYPE;
Begin
SELECT Sal
INTO V_sal
FROM emp
WHERE empno = and P_empno;
IF (V_Sal<1000) THEN
UPDATE emp
INTO Sal := Sal*1.1
WHERE empno = and P_empno;
END IF;
END;
B. Declare
V_sal emp.sal % TYPE;
Begin
SELECT Sal
INTO V_sal
FROM emp
WHERE empno = and P_empno;
IF (V_Sal<1000) THEN
SAL := SAL * 1.1;
END IF;
END;
C. Declare
V_sal emp.sal % TYPE;
Begin
SELECT Sal
INTO V_sal
FROM emp
WHERE empno = and P_empno;
IF (V_Sal<1000) THEN
UPDATE emp
Sal := Sal*1.1
WHERE empno = and P_empno;
END IF;
END;
D. Declare
V_sal emp.sal % TYPE;
Begin
SELECT Sal
INTO V_sal
FROM emp
WHERE empno = and P_empno;
IF (V_Sal<1000) THEN
UPDATE emp
Set Sal := Sal*1.1
WHERE empno = and P_empno;
END IF;
END;

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Answer: D

Explanation:
Answer D is correct because it's using cursor and IF-THEN structure
correctly to increase salary for all employees with current salary less than 1000.
Incorrect Answers:
A: UPDATE <table_name> INTO is wrong construction for UPDATE command
B: There is no SAL variable defined in PL/SQL block, so SAL:=SAL*1.1 will fail and
it's wrong way to change value of column Sal in table EMP.
C: Sal:=Sal*1.1 can not be inside UPDATE ... WHERE command.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 215-217
Chapter 8: Introducing PL/SQL