A primary key is a field or set of fields with values that are unique throughout a table. Values of the key can be used to refer to entire records, because each record has a different value for the key. Each table can only have one primary key.
WHAT IS A PRIMARY KEY?
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A foreign key is a field (or fields) in one table that references the primary key in another table.
WHAT IS A FOREIGN KEY?
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NullThe Null value indicates that the Variant contains no valid data. Null is not the same as Empty, which indicates that a variable has not yet been initialized.
TableTables are essential objects in a database because they hold all the information or data.
Informationfacts provided or learned about something or someone.
data information that has been translated into a form that is efficient for movement or processing.
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FieldContains data about one aspect of the table subject, such as first name or e-mail address.
RecordContains specific data, like information about a particular employee or a product.
Filecan control access to data in specified tables and columns, or to tables and columns for which access is not granted explicitly.
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