Tutorial 4
Building a database
Creating and Managing Tables
• [ ]Create tables
• [ ]Describe the data types that can be
used when specifying column definition
– Use the help command to find out the data
types.
• [ ]Alter table definitions
• [ ]Insert rows into a table
Exercise 1 on create
• Using the Joe’s Yard ERD, build the tables
in your own database, without marking any
field as a key field.
– Remember to use the same data type for a
field as a foreign key as was used in the table
in which it is a primary key.
• Alter the tables to add primary keys.
• Alter the tables to add foreign keys.
• Save the query.
Exercise 2 on create
• Write a query to drop all of the tables you
have set up.
• Using creates, with primary and foreign
keys, build the entire database for Joe’s
Yard.
• Run the drop query followed by the create
query.
• Save both queries.
The ‘insert’ command
• Inserting data into a table
• To add a row of data to a table
INSERT INTO <table> VALUES
(value1, value2, …valueN)
• If the value list matches the column list exactly, there is
no need to list the column names.
• If the value list does not match the column list exactly,
there is a need to list the column names.
– E.g. insert into dog values
('JEFF','JEFFREY',20,4,'STANDARD','HALF-HOUR
WALK','GDAN') or
– insert into dog (DogId, Breed_Id) values
('JANE','GDAN')
• Note: The other fields will be nulls.
Exercise on insert
• Add the customers Andy Handy and John
O’Connell to the customer table. Use suitable
values for the other fields.
• Add Mick Murphy and Joe Bloggs to the staff
table as yard foremen.
• Add docket numbers 196 and 201 to the docket
table.
• Populate the stock table with items from the
sample dockets given.
– What other tables need to be populated first?