Oracle Exam key concepts related to exporting and importing End User Layers (EULs) - mcsaclass.com

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Oracle Exam key concepts related to exporting and importing End User Layers (EULs)

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