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IBM DB2 9 Family Fundamentals Sample Questions:

1. Given the following table definitions:
EMPLOYEES
EMPID INTEGER
NAME CHAR(20)
DEPTID CHAR(3)
SALARY DECIMAL(10,2)
COMMISSION DECIMAL(8,2)
DEPARTMENTS
DEPTNO INTEGER DEPTNAME CHAR(20)
Which of the following statements will produce a result data set that satisfies all of these conditions:
> Displays the total number of employees in each department >> Displays the corresponding department name for each department ID >> Sorted by department employee count, from greatest to least

A) SELECT *,COUNT(empno) FROM departments, employees WHERE deptid = deptno GROUP BY deptname ORDER BY 2 DESC
B) SELECTdeptname, COUNT(*) FROM departments, employees WHERE deptid = deptno GROUP BY deptname ORDER BY 2
C) SELECTdeptname, COUNT(empno) FROM departments, employees WHERE deptid = deptno GROUP BY deptname ORDER BY 2 DESC
D) SELECTdeptname, COUNT(empno) FROM departments, employees WHERE deptid = deptno GROUP BY deptname ORDER BY 2 ASC

2. If the following SQL statements are executed:
CREATE TABLE make (makeid SMALLINT NOT NULL PRIMARY KEY,
make VARCHAR(25));
CREATE TABLE model (modelid SMALLINT,
model VARCHAR(25),
makeid SMALLINT,
CONSTRAINT const1 FOREIGN KEY (makeid)
REFERENCES make(makeid) ON DELETE RESTRICT);
And each table created is populated as follows:
MAKE
MAKEID MAKE
1 Ford 2 Chevrolet 3 Toyota
MODEL
MODELID MODEL MAKEID
1 Mustang 1 2 Escort 1 3 Malibu 2 4 Camry 3
If the following SQL statement is executed:
DELETE FROM make WHERE makeid = 1
What is the total number of rows that will be deleted?

A) 0
B) 3
C) 1
D) 2

3. Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?

A) SELECT (dept) UNIQUE FROM staff
B) SELECT UNIQUE dept FROM staff
C) SELECT DISTINCT dept FROM staff
D) SELECT (dept) DISTINCT FROM staff

4. Given the following CREATE TABLE statement:
CREATE TABLE table2 LIKE table1
Which two of the following will NOT occur when the statement is executed?

A) TABLE2 will have the samenullability characteristics as TABLE1
B) TABLE2 will have the same referential constraints as TABLE1
C) TABLE2 will have the same column names and column data types as TABLE1
D) TABLE2 will have the same column defaults as TABLE1
E) TABLE2 will have the same indexes as TABLE1.

5. Which of the following SQL statements will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000?

A) SELECT * FROM t1 INTERSECT SELECT * FROM t2
B) SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)
C) SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2
D) SELECT * FROM t1 UNION SELECT * FROM t2

Solutions: