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Q1. Consider the my_table table with two integer columns, a and b, and the contents as shown; Mysql > SELECT a, b FROM my_table;
1 row in set result of this query? SELECT a—b
FROM my_table;
A. 0
B. 2
C. 4
D. An error message
Answer: A
Q2. The data from t1 table is:
Assuming You want to see this output:
Which query achieves the preceding result?
A. SELECT name FROM t1 WHERE name LIKE ,_e%
B. SELECT name FROM t1 WHERE name LIKE,e%.;
C. SELECT name FROM t1 GROUP BY name ORDER by name LIMIT 1,1;
D. SELECT name FROM t1 GROUP BY name HAVING sun ( marks)=176 ORDER BY name;
Answer: C
Q3. Consider the content of the class and student tables: Class
Which three queries produce the same result?
A. SELECT *
FROM class
INNER JOIN student
ON class.class_id=student.class_id
B. SELECT *
FROM JOIN student LEFT JOIN student
ON class. Class.class_id=student.class_id
C. SELECT *
FROM class
INNER JOIN student
WHERE NOT ISNULL (student.class_id)
D. SELECT *
FROM JOIN student
On class .class_id=student.class_id WHERE NOT ISNULL (student.class_id)
E. SELECT *
FROM student RIGHT JOIN class
ON class.class_id=student.class_id
Answer: D
Q4. Which statement correctly demonstrates using a subquery as a scalar expression?
A. SELECT (
SELECT SUM (population) FROM Country
SELECT SUM (population) FROM Country
WHERE Code =’CAN’
)
B. SELECT SUM (population) FROM Country
WHERE Code =”USA”
+ (SELECT SUM (population) FROM Country
WHERE Code =.’CAN’
)
C. SELECT
(SELECT SUM (population) FROM Country
WHERE Code =’USA’
FROM country WHERE Code= ‘CAN’
)
D. (SELECT SUM (population) FROM Country
WHERE Code =”USA’
Answer: D
Explanation: Reference:http://dev.mysql.com/doc/refman/5.0/en/scalar-subqueries.html
Q5. Assume that none of the databases exist. Which statement results in an error?
A. CREATE DATABASE $test
B. CREATE DATABASE 1$
C. CREATE DATABASE $
D. CREATE DATABASE _
E. CREATE DATABASE 12
Answer: A
Q6. A statement exists that can duplicate the definition of the ‘world’table.
What is missing?
CREATE TABLE t1 world
A. FROM
B. USING
C. COPY
D. LIKE
Answer: D
Q7. Examine the structure and content of the MemberLocation table:
You want to have the field location returned in all letters (example: BERLIN). Which query would you use?
A. SELECT UPPER (Location) as location FROM MemberLocation
B. SELECT UPPER (BINARY location) as location FROM MemberLocation
C. SELECT UPPER (location AS UPPER ) as location FROM Memberlocation
D. SELECT CONVERT (Location AS UPPER ) as location FROM memberlocation
Answer: A
Explanation:
https://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_upper
Q8. In the office table, the city column is structured as shown: Mysql> show columns from office like ‘city’\G
•••---------------------------------------------------1. row ---------------------
Field: city
Type: enum(‘paris’.’Amsterdam’.’New York’.’Tokyo’) Null: Yes
Key: Default:NULL Extra:
Consider the output of the SELECT query executed on the office table: Mysql> SELECT DISTINCT city FROM office ORDER BY city:
If the query is written as:
SELECT DISTINCT city FROM office ORDER BY CAST(city AS CHAR)
In what order are the rows returned?
A. Paris, Amsterdam. New York, Tokyo
B. Tokyo, New York, Amsterdam, Paris
C. Amsterdam, New York, Paris, Tokyo
D. Tokyo, Paris, New York, Amsterdam
Answer: C
Q9. Assume the user has just connected to the MySQL server.
What is the result of the query SELECT @ a?
A. An error that @ a is undefined
B. A single NULL
C. An empty string
D. The value of GLOBAL variable @ a
Answer: B
Q10. As a developer, you inherit this table as part of a project: CREATE TABLE exam (
Exam_id INTEGER UNSIGNED NOT NULL PRIMARY KEY,
Examinee_id INTEGER UNSIGNED UNIQUE, Score INTEGER UNSIGNED
)
What change should you make to ensure that examinee_id is an integer value throughout the table?
A. The examinee_id column should be designated as PRIMARY KEY.
B. A NOT NULL qualifier should be moved from exam-id to examinee-id.
C. The PRIMARY KEY should be dropped and re-created as PRIMARY KEY (examinee-id, exam_id).
D. A NOT NULL qualifier should be added to examinee_id.
Answer: A