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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 matching string. select records which fit certain conditions. Ready-made database files are available on: The cloud CD-ROM’s
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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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