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Oracle Database 10g: SQL Fundamentals I

Oracle Training Customize language dependent behavior for the database and individual sessions

Examine the structure of the EMPLOYEES table:
EMPLOYEE_ID NUMBER NOT NULL
EMP_NAME VARCHAR2(30)
JOB_ID VARCHAR2(20) DEFAULT 'SA_REP'
SAL NUMBER
COMM_PCT NUMBER
MGR_ID NUMBER
DEPARTMENT_ID NUMBER
You need to update the records of employees 103 and 115. The UPDATE statement you specify should update
the rows with the values specified below:
JOB_ID: Default value specified for this column definition.
SAL: Maximum salary earned for the job ID SA_REP.
COMM_PCT: Default value specified for this commission percentage column, if any.
If no default value is specified for the column, the value should be NULL.
DEPARTMENT_ID: Supplied by the user during run time through substitution variable.
Which UPDATE statement meets the requirements?

A. UPDATE employees
SET job_id = DEFAULT
AND Sal = (SELECT MAX(sal)
FROM employees
WHERE job_id = 'SA_REP')
AND comm_pct = DEFAULT
AND department_id = &did
WHERE employee _id IN (103,115);
B. UPDATE employees
SET job_id = DEFAULT
AND Sal = MAX(sal)
AND comm_pct = DEFAULT OR NULL
AND department_id = &did
WHERE employee_id IN (103,115)
AND job _ id = 'SA_ REP';
C. UPDATE employees
SET job_id = DEFAULT,
Sal = (SELECT MAX(sal)
FROM employees
WHERE job_id = 'SA_REP'),
comm_pct = DEFAULT,
department_id = &did
WHERE employee_id IN (103,115);
D. UPDATE employees
SET job_id = DEFAULT,
Sal = MAX(sal),
comm_pct = DEFAULT,
department_id = &did
WHERE employee_id IN (103,115)
AND job _ id = 'SA_ REP';
E. UPDATE employees
SET job_id = DEFAULT,
Sal = (SELECT MAX(sal)
FROM employees
WHERE job_id = 'SA_REP')
comm_pct = DEFAULT OR NULL,
department_id = &did
WHERE employee_id IN (103,115);

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Answer: C

Explanation:
This UPDATE statement is correct to receive desired results. Correct syntax is UPDATE table_name SET
column_name1 = value, column_name2 = value2. You can also use the DEFAULT keyword to set a column
value to its specified default value in update statements as well.
Incorrect Answers
A: You cannot use syntax like UPDATE table_name SET column_name1 = value AND column_name2 =
value2. Correct syntax is UPDATE table_name SET column_name1 = value, column_name2 = value2.
B: You cannot use syntax like UPDATE table_name SET column_name1 = value AND column_name2 =
value2. Correct syntax is UPDATE table_name SET column_name1 = value, column_name2 = value2.
D: Group function is not allowed to use in the SET clause of the UPDATE command.
E: You cannot set column to value DEFAULT OR NULL: this is wrong syntax to use.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 267-270
Chapter 6: Manipulating Oracle Data