W3 SQL Flashcards
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What does SQL stand for?
Structured Query Language
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Which SQL statement is used to extract data from a database?
SELECT
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Which SQL statement is used to update data in a database?
UPDATE
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Which SQL statement is used to delete data from a database?
DELETE
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Which SQL statement is used to insert new data in a database?
INSERT INTO
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With SQL, how do you select a column named “FirstName” from a table named “Persons”?
SELECT FirstName FROM Persons
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With SQL, how do you select all the columns from a table named “Persons”?
SELECT * FROM Persons
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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’
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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%’
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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
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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’
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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’
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Which SQL statement is used to return only different values?
SELECT DISTINCT
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Which SQL keyword is used to sort the result-set?
ORDER BY
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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
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With SQL, how can you insert a new record, Jimmy and Jackson, into the “Persons” table?
INSERT INTO Persons VALUES (‘Jimmy’, ‘Jackson’)
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With SQL, how can you insert “Olsen” as the “LastName” in the “Persons” table?
INSERT INTO Persons (LastName) VALUES (‘Olsen’)
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How can you change “Hansen” into “Nilsen” in the “LastName” column in the Persons table?
UPDATE Persons SET LastName=’Nilsen’ WHERE LastName=’Hansen’
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With SQL, how can you delete the records where the “FirstName” is “Peter” in the Persons Table?
DELETE FROM Persons WHERE FirstName = ‘Peter’
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With SQL, how can you return the number of records in the “Persons” table?
SELECT COUNT(*) FROM Persons
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What is the most common type of join?
INNER JOIN
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Which operator is used to select values within a range?
RANGE
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The NOT NULL constraint enforces a column to not accept NULL values.
False
NOT NULL prevents NULL values from being accepted
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Which operator is used to search for a specified pattern in a column?
LIKE
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Which SQL statement is used to create a database table called ‘Customers’?
CREATE TABLE Customers
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%
Represents zero or more characters
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_ (underscore)
Represents a single character
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[]
Represents any single character within the brackets *
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^
Represents any character not in the brackets *
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-
Represents any single character within the specified range *
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{}
Represents any escaped character **
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SELECT
extracts data from a database
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UPDATE
updates data in a database
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DELETE
deletes data from a database
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INSERT INTO
inserts new data into a database
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CREATE DATABASE
creates a new database
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ALTER DATABASE
modifies a database
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CREATE TABLE
creates a new table
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ALTER TABLE
modifies a table
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DROP TABLE
deletes a table
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CREATE INDEX
creates an index
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DROP INDEX
deletes an index
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SELECT * FROM Customers
WHERE CustomerName LIKE '%es';
Return all customers that ends with the pattern ‘es’
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SELECT * FROM Customers
WHERE CustomerName LIKE '%mer%';
What does this sql block return?
Return all customers that contains the pattern ‘mer’
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SELECT * FROM Customers
WHERE City LIKE '_ondon';
What does this sql block return?
Return all customers with a City starting with any character, followed by “ondon”
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SELECT * FROM Customers
WHERE City LIKE 'L_ _ _on';
What does this sql block return?
Return all customers with a City starting with “L”, followed by any 3 characters, ending with “on”
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SELECT * FROM Customers
WHERE CustomerName LIKE '[bsp]%';
What does this sql block return?
Return all customers starting with either “b”, “s”, or “p”
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SELECT * FROM Customers
WHERE CustomerName LIKE '[a-f]%';
What does this sql block return?
Return all customers starting with “a”, “b”, “c”, “d”, “e” or “f”
