Database Design

And Implementation

Done so far…

• Started a design of your own data model

• In Software Engineering, recognised the processes that occur in the system.

To do…

• Implement the data model using CREATE statements– In SQL Server– In Oracle

• Populate the data model using inserts• Design

– Queries that will be relevant to the system– Transactions that will cause the data to flow

through the system.

Data model

– Give the attributes:• data types• Check constraints

– Note any checks that need to be done that cannot be done in the CREATE statement.

• Later, these can be implemented through triggers.

– Decide on the sample of data you want to use to populate your model.

Implementing your model in SQL Server

• Keep your SQL Server SQL separate from your Oracle SQL.– Set up a SQL Server implementation directory

for your .SQL files.• E.g. U:\databases\SQLServer\MYMODEL.SQL

– Implement the CREATEs in SQL Server– Populate the model using ‘INSERT’

statements.

Implementing your model in SQL Server

• Keep your SQL Server SQL separate from your Oracle SQL.– Set up a SQL Server implementation directory

for your .SQL files.• E.g. U:\databases\SQLServer\MYMODEL.SQL

– Implement the CREATEs in SQL Server– Populate the model using ‘INSERT’

statements.

Copy to Oracle

• Set up an Oracle implementation directory– E.g. U:\databases\Oracle\

• Copy the SQL from your SQL Server directory

• Note the differences in syntax between Oracle create and SQL Server create.

• Change the Oracle SQL.

Design your processes

• Using the processes uncovered in Software Engineering– Design transactions to implement those

processes

• Design queries that would be useful in your system.– When you think about this, it can help you to

decide what data you want in your system.

More Data Manipulation language

• We have done:– Insert– Select

• To do:– Delete– Update

Delete

• To delete from a table:– Delete from <table> where <condition>

• E.g.(see handout)– Delete from STUDENT where MINIT like ‘B’;

• Note:– 1. This may not work. Look at the handout

and decide why.

Update

Update <tablename>

set <field> = <expression>

Where <condition>

e.g.

Update student

set FNAME = ‘Sidney’

Where SID = 2222;