SQL Quiz

With SQL, how can you delete the records where the "FirstName" is "Peter" in the Persons Table?

DELETE FROM Persons WHERE FirstName = 'Peter';

What is the most common type of join?

INNER JOIN

π (pi)

Projection

Which SQL statement is used to insert new data in a database?

INSERT INTO

With SQL, how can you insert a new record into the "Persons" table?

INSERT INTO Persons VALUES ('Jimmy', 'Jackson');

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

ORDER BY

Which SQL statement is used to extract data from a database?

SELECT

The NOT NULL constraint enforces a column to not accept null values.

TRUE

With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Peter" and the "LastName" is "Jackson"?

SELECT * FROM Persons WHERE FirstName='Peter' AND LastName='Jackson';

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" is "Peter"?

SELECT * FROM Persons WHERE FirstName='Peter';

With SQL, how do you select all the records from a table named "Persons" where the "LastName" is alphabetically between (and including) "Hansen" and "Pettersen"?

SELECT * FROM Persons WHERE LastName BETWEEN 'Hansen' AND 'Pettersen';

How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?

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

With SQL, how do you select a column named "FirstName" from a table named "Persons"?

SELECT FirstName FROM Persons;

What does the following SQL statement do? SELECT Customer, COUNT(Order) FROM Sales GROUP BY Customer HAVING COUNT(Order) >5;

Selects all customers from table Sales that have made more than 5 orders.

⋈ (bow-tie)

Simple Inner Join

Which of the following 3 SQL statements is correct?

SELECT Username, Password FROM Users;

Which SQL statement is used to create a table in a database?

CREATE TABLE

With SQL, how can you insert "Olsen" as the "LastName" in the "Persons" table?

INSERT INTO Persons (LastName) VALUES ('Olsen');

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?

SELECT * FROM Persons WHERE FirstName LIKE 'a%';

With SQL, how do you select all the columns from a table named "Persons"?

SELECT * FROM Persons;

What SQL statement selects all rows from a table called Products and orders the result set by ProductID column?

SELECT * FROM Products ORDER BY ProductID

With SQL, how can you return the number of records in the "Persons" table?

SELECT COUNT(*) FROM Persons;

Which of the following SQL statements is correct?

SELECT CustomerName, COUNT(CustomerName) FROM Orders GROUP BY CustomerName;

Which SQL statement is used to return only different values?

SELECT DISTINCT

What does SQL stand for?

Structured Query Language

The OR operator displays a record if ANY conditions listed are true. The AND operator displays a record if ALL of the conditions listed are true

TRUE

Consider the fragment "from clients left outer join salespersons", which is the left table? which is the right table?

clients is the left table, salespersons is the right table

Which operator is used to select values within a range?

BETWEEN

Which of the following is a SQL aggregate function?

MIN SUM AVG

σ (sigma)

Selection

With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?

SELECT * FROM Persons ORDER BY FirstName DESC;

What does the UNION operator do?

The UNION operator combines the results of two or more queries into a one result that includes all the rows from the queries in the union.

Which operator is used to search for a specified pattern in a column?

LIKE