Tag: databases

Quizzes (243) Questions (4862)

Questions Related to databases

Multiple choice technology databases

Given that tables T1 and T2 contain the following rows : Table T1 : C1 C2 (5 4) (5 2) (5 5) Table T2 : C1 C2 (5 1) (5 2) (5 3) Which of the following queries will return only those rows that exists in T1 and not in T2 ?

  1. Select * from T1 minus select * from T2

  2. Select * from T1 except select * from T2

  3. Select * from T1 union except select * from T2

  4. Select * from T1 not exists select * from T2
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology databases

Given the following two tables: TAB1 C1 C2 1 Antarctica 2 Africa 3 Asia 4 Australia TAB2 CX CY 5 Europe 6 North America 7 South America Which of the following SQL statements will insert all rows found in table TAB2 into table TAB1?

  1. INSERT INTO tab1 SELECT cx, cy FROM tab2

  2. INSERT INTO tab1 VALUES (tab2.cx, tab2.cy)

  3. INSERT INTO tab1 VALUES (SELECT cx, cy FROM tab2)

  4. INSERT INTO tab1 (c1, c2) VALUES (SELECT cx, cy FROM tab2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation
Multiple choice technology databases

Given the following table and XML data stored in the CONTACTINFO column: CREATE TABLE clients( id INT PRIMARY KEY NOT NULL, name VARCHAR(50), status VARCHAR(10), contactinfo XML ) 25 EastCreek Toronto OntarioM8X-3T6 4165551358 9051112222 9051112222 by fax What is the result of the following XQuery expression? for $y in db2-fn:xmlcolumn('CLIENTS.CONTACTINFO')/Client//fax return $y

  1. 4165551358

  2. 9051112222

  3. No results because there is no child element

  4. No results because the XQuery expression is not a valid FLWOR expression
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology databases

Given the table, Customer contain the following data Customer Table: Product-ID Quantity 1 5 2 3 3 4 The following sequence of statement performed at the single unit of work: UPDATE Customer SET Quantity = 3 WHERE Product-ID = 1; SAVEPOINT s1 ON ROLLBACK RETAIN CURSORS; UPDATE Customer SET Quantity = 5 WHERE Product-ID = 3; INSERT INTO Customer VALUES (5, 20); SAVEPOINT s2 ON ROLLBACK RETAIN CURSORS; INSERT INTO Customer VALUES (4, 10); ROLLBACK TO SAVEPOINT s1; INSERT INTO Customer VALUES (6, 10); INSERT INTO Customer VALUES (7, 15); COMMIT;

  1. 1-5, 2-3, 3-5, 4-10, 5-20, 6-10, 7-15

  2. 1-3, 2-3, 3-4, 6-10, 7-15

  3. 1-3, 2-3, 3-4, 4-10, 5-20, 6-10, 7-15

  4. 1-3, 2-3, 3-4
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology databases

Given the following table and XML data stored in the EMPDETAILS column: CREATE TABLE employees (Emp-id INT PRIMARY KEY NOT NULL, Emp-name VARCHAR (20), Empdetails XML) The data in the EMPDETAILS are ProjectManager Chennai 987654 What is the result of the following XQuery Expression? For $y in db2-fn:xmlcolumn(EMPLOYEES. EMPDETAILS’)/Employee/designation return $y

  1. <designation>ProjectManager</designation>

  2. ProjectManager

  3. chennai

  4. <pincode>987654</pincode>
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation