SQL Set 1

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This set of DataBase Management System (DBMS) Multiple Choice Questions & Answers (MCQs) focuses on SQL Set 1

Q1 | What does DML stand for?

Different Mode Level

Data Model Language

Data Mode Lane

Data Manipulation language

Q2 | With SQL, how do you select all the records from a table named “Persons” where the valueof the column “FirstName” ends with an “a”?

SELECT * FROM Persons WHERE FirstName=’a’

SELECT * FROM Persons WHERE FirstName LIKE ‘a%’

SELECT * FROM Persons WHERE FirstName LIKE ‘%a’

SELECT * FROM Persons WHERE FirstName=’%a%’

Q3 | With SQL, how can you return all the records from a table named “Persons” sorteddescending by “FirstName”?

SELECT * FROM Persons SORT BY ‘FirstName’ DESC

SELECT * FROM Persons ORDER FirstName DESC

SELECT * FROM Persons SORT ‘FirstName’ DESC

SELECT * FROM Persons ORDER BY FirstName DESC

Q4 | With SQL, how can you return the number of not null records in the “Persons” table?

SELECT COUNT() FROM Persons

SELECT COLUMNS() FROM Persons

SELECT COLUMNS(*) FROM Persons

SELECT COUNT(*) FROM Persons

Q5 | What does the ALTER TABLE clause do?

The SQL ALTER TABLE clause modifies a table definition by altering, adding, or deleting table columns and/or constraints

The SQL ALTER TABLE clause is used to insert data into database table

THE SQL ALTER TABLE deletes data from database table

The SQL ALTER TABLE clause is used to delete a database table

Q6 | The UPDATE SQL clause can _____________

update only one row at a time

update more than one row at a time

delete more than one row at a time

delete only one row at a time

Q7 | The UNION SQL clause can be used with _____________

SELECT clause only

DELETE and UPDATE clauses

UPDATE clause only

All of the mentioned

Q8 | Which SQL statement is used to return only different values?

SELECT DIFFERENT

SELECT UNIQUE

SELECT DISTINCT

SELECT ALL

Q9 | Which SQL keyword is used to sort the result-set?

ORDER BY

SORT

ORDER

SORT BY

Q10 | How can you change “Hansen” into “Nilsen” in the “LastName” column in the Persons table?

UPDATE Persons SET LastName=’Hansen’ INTO LastName=’Nilsen’

MODIFY Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’

MODIFY Persons SET LastName=’Hansen’ INTO LastName=’Nilsen’

UPDATE Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’

Q11 | Which of the following command makes the updates performed by the transactionpermanent in the database?

ROLLBACK

COMMIT

TRUNCATE

DELETE

Q12 | Which TCL command undo all the updates performed by the SQL in the transaction?

ROLLBACK

COMMIT

TRUNCATE

DELETE

Q13 | SQL query to find all the cities whose humidity is 95.

SELECT city WHERE humidity = 95

SELECT city FROM weather WHERE humidity = 95

SELECT humidity = 89 FROM weather

SELECT city FROM weather

Q14 | SQL query to find the temperature in increasing order of all cities.

SELECT city FROM weather ORDER BY temperature

SELECT city, temperature FROM weather

SELECT city, temperature FROM weather ORDER BY temperature

SELECT city, temperature FROM weather ORDER BY city

Q15 | What is the meaning of LIKE ‘%0%0%’?

Feature begins with two 0’s

Feature ends with two 0’s

Feature has more than two 0’s

Feature has two 0’s in it, at any position

Q16 | Find the names of these cities with temperature and condition whose condition is neithersunny nor cloudy.

SELECT city, temperature, condition FROM weather WHERE condition NOT IN (‘sunny’, ‘cloudy’)

SELECT city, temperature, condition FROM weather WHERE condition NOT BETWEEN (‘sunny’, ‘cloudy’)

SELECT city, temperature, condition FROM weather WHERE condition IN (‘sunny’, ‘cloudy’)

SELECT city, temperature, condition FROM weather WHERE condition BETWEEN (‘sunny’, ‘cloudy’);

Q17 | Find the name of those cities with temperature and condition whose condition is either sunny or cloudy but temperature must be greater than 70.

SELECT city, temperature, condition FROM weather WHERE condition = ‘sunny’ AND condition = ‘cloudy’ OR temperature > 70

SELECT city, temperature, condition FROM weather WHERE condition = ‘sunny’ OR condition = ‘cloudy’ OR temperature > 70

SELECT city, temperature, condition FROM weather WHERE condition = ‘sunny’ OR condition = ‘cloudy’ AND temperature > 70

SELECT city, temperature, condition FROM weather WHERE condition = ‘sunny’ AND condition = ‘cloudy’ AND temperature > 70

Q18 | Find all the tuples having a temperature greater than ‘Paris’.

SELECT * FROM weather WHERE temperature > (SELECT temperature FROM weather WHERE city = ‘Paris’

SELECT * FROM weather WHERE temperature > (SELECT * FROM weather WHERE city = ‘Paris’)

SELECT * FROM weather WHERE temperature > (SELECT city FROM weather WHERE city = ‘Paris’)

SELECT * FROM weather WHERE temperature > ‘Paris’ temperature

Q19 | Find all the cities with temperature, condition and humidity whose humidity is in the rangeof 63 to 79.

SELECT * FROM weather WHERE humidity IN (63 to 79)

SELECT * FROM weather WHERE humidity NOT IN (63 AND 79)

SELECT * FROM weather WHERE humidity BETWEEN 63 AND 79

SELECT * FROM weather WHERE humidity NOT BETWEEN 63 AND 79

Q20 | The command to remove rows from a table ‘CUSTOMER’ is __________________

DROP FROM CUSTOMER

UPDATE FROM CUSTOMER

REMOVE FROM CUSTOMER

DELETE FROM CUSTOMER WHERE

Q21 | What type of join is needed when you wish to include rows that do not have matchingvalues?

Equi-join

Natural join

Outer join

All of the Mentioned

Q22 | What type of join is needed when you wish to return rows that do have matching values?

Equi-join

Natural join

Outer join

All of the Mentioned

Q23 | Which of the following is one of the basic approaches for joining tables?

Subqueries

Union Join

Natural join

All of the Mentioned

Q24 | The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID,ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T WHERE CUSTOMER_T. CUSTOMER_ID = ORDER_T. CUSTOMER_ID?

Equi-join

Natural join

Outer join

Cartesian join

Q25 | A UNION query is which of the following?

Combines the output from no more than two queries and must include the same number of columns

Combines the output from no more than two queries and does not include the same number of columns

Combines the output from multiple queries and must include the same number of columns

Combines the output from multiple queries and does not include the same number of columns

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