Download Databases

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 Results
id
name
Dob
phone
class
356
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
This query allows you to add new records
into the database table
INSERT INTO tableName (column1,
column2, column3)
VALUES (value1, value2, value3)
Returned Results
Inserted Correctly – 1 (or true)
Not inserted Correctly – 0 (or False)
Challenges
Bronze
Select all of the information out of the film table
Silver
1. Select on the data from the film table where the rating is
equal to 15
2. 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
This query allows you to update record(s) in
the database table
UPDATE table_name
SET column1=value, column2=value2
WHERE some_column=some_value
Returned Results
Inserted Correctly – 1 (or true)
Not inserted Correctly – 0 (or False)
Delete
This query allows you to delete record(s) in
the database table
DELETE FROM tableName
WHERE some_column = some_value
Returned Results
Inserted Correctly – 1 (or true)
Not inserted Correctly – 0 (or False)
Challenges
Bronze
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
Silver
Das 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.