What we’ve learnt Doc 5.69 Doc 5.70 Section 1-3. A simple database Related objects Tables hold the data Forms, reports, queries to access the data.

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Presentation transcript:

What we’ve learnt Doc 5.69 Doc 5.70 Section 1-3

A simple database Related objects Tables hold the data Forms, reports, queries to access the data

Database FADS Create FADS Create object in FADS, e.g Owners table, Ownersphone query Don’t need to create a new database for each new object Database FADS is container for objects

Wizards can help Tables for standard components e.g customers You can customise the standard components Report wizard generates reports Form Wizard generates forms

About tables Tell you about things (entities) Entities have characteristics (attributes) such as names, addresses, ages Attributes are represented by fields in the table Fields have data type - e.g number, dates. Access 97 provides default types, sizes - you can change them.

Keys Data in the table is held in records Each record must have a unique identifier - Primary Key Relationships between tables are represented by Foreign Keys e.g Cats table has a field Ownerid Ownerid is the primary key (unique identifier) of the owner in the Owners table.

Data Model Diagram CatsOwners Bookings

Queries that join tables Need data about Owners and Cats Vacbooster is a query that joins data from two tables Temporary data - called a dynaset Doesn’t change the data in the tables

Joining Tables Relationships allow you to combine data about more than one thing. E.g Cats and Owners, Students and staff, Suppliers and products. Owners/Cats relationship is Each Owner can own one or more cats One to Many relationship Must include the unique identifier of the one as foreign key in many