Objects within a database

Objects within a database

1. Tables

   • store the data itself

2. Queries

   • Used to answer questions about the data. Can extract and display records which match certain criteria
   • Queries answer question about your data
   • can be used to view, alter and analyse data from one or more tables in a database
   • Can be used as the source of records in forms and reports
   • Only the required data is displayed
   • Can be saved for future use
   • Wildcard symbols and maths operators can be used
     • E.g. 'Or', 'and' '< and>' Between...and...
   • Criteria can be combined e.g. >25 and <50
   • Wildcards can be used
     • * matches any number of characters or none
     • ? matches exactly one character

3. Reports

   • Used to format the output of data from tables or queries in a user friendly way - mainly for printing

4. Forms

   • Used to input and/or output data in a user friendly way - for on - screen use
   • Easily created using 'Wizards'
   • Forms can be used to both input and output data records
   • Allow records to be presented in a user friendly way
   • Text can be enhanced and additional text added
   • Allow command buttons to be added
   • Can be edited using a form editor
   • Best approach is to create a basic form using wizard then modify it.
   • You can add records modify records and delete records
   • When you move off the record, the changes are made automatically to the table.
   • Be careful when deleting records