Presentation on theme: "Databases. A database program can be used to: sort a file into a different order Maintain contact with clients search through the records for a."— Presentation transcript:
A database program can be used to: sort a file into a different order Maintain contact with clients search through the records for a matching string. select records which fit certain conditions
Ready-made database files are available on: The cloud CD-ROM’s By purchasing CRM or Database software on line. Within other operating systems than Microsoft e.g. Android
Before you can create your own database file you have to: decide what data is required for the problem you are solving; think of a name for your data file; plan what fields you are going to have; decide on a key field or sort field; plan how to collect and record the data before it is typed in.
Common data types used in databases are: Boolean Text Number Date Integer Currency Logical
Data can be collected by recording it on a data capture form. This can be one of the following questionnaire (form format) questionnaire (table format)
To create a database you would normally have to: produce a data capture form; collect and record the data to be keyed it; run the database program; name the database file; key in for each field its name, type and possibly its length; choose a sort field; enter the data into the database - one record at a time; close or save the database.
To retrieve information from a file you can set up a query condition. The program then selects all records which match the condition. Query conditions can include: comparisons based on = (equal to) < (less than) > (greater than) <>, >=, <= the logical operators AND, OR and NOT; comparisons with sub-strings.
A sort rearranges a file into a given order. A file can be sorted into ascending or descending order. A database report is a set of results from work on a database put together as a document for printing. A query language is the set of words and symbols which are used to retrieve information from a database.
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