Querying

Querying

Its about asking questions of the database in order to get some results

The are 4 different types of queries that we can run

Different query types SELECT UPDATE INSERT DELETE (use with care!!)

SELECT

This query is one which will bring data back from the database, so you’re able to

use the information

SELECT * FROM tableName WHERE x=y

Returned Resultsid name Dob phone clas

s356 Jess 3 Mar 1995 12345 678904 5B

412 Hamad 12 Nov 1994 67890 234592 7X

459 Sita 9 Jan 1994 12345 765434 5B

502 James 10 March 09876 65432 6B

INSERT

Inserted Correctly – 1 (or true)Not inserted Correctly – 0 (or False)

INSERT INTO tableName (column1, column2, column3)

VALUES (value1, value2, value3)

Returned Results

This query allows you to add new records into the database table

ChallengesBronze Select all of the information out of the film table

Silver1. Select on the data from the film table where the rating is equal to

152. Select the data from the directors table where the director is

from the USA.

Gold Insert another three films into the film table but the films director must be James Cameron or Frank Darabont. You will also have to insert the Directors into the directors table

Any SELECT results need to be screen printed and then put into a word document as results.

Update

Inserted Correctly – 1 (or true)Not inserted Correctly – 0 (or False)

UPDATE table_nameSET column1=value,

column2=value2WHERE some_column=some_value

Returned Results

This query allows you to update record(s) in the database table

Delete

Inserted Correctly – 1 (or true)Not inserted Correctly – 0 (or False)

DELETE FROM tableNameWHERE some_column = some_value

Returned Results

This query allows you to delete record(s) in the database table

WARNING

Be VERY careful when

using the delete function

ChallengesBronze There has been a mistake in data that has been entered, and the wrong certification has been awarded to The Dark Knight, it’s now a 15

SilverDas Boot and The good the bad and the ugly need to be removed, update the list to show this

Gold Come up with a could of queries of your own, and don’t forget to screenshot them and paste them into your word document.