A key field is a field of a database table which forms an identifier for a record. It holds a unique data which distinguishes the record from all the other records in the database.
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In Microsoft Access, a key field (or primary key) is a unique identifier for records in a table. It ensures that each record can be uniquely distinguished from others, preventing duplicate entries. Typically, a key field is set to be a single field, such as an ID number, but it can also be a combination of multiple fields. Defining a key field is essential for maintaining data integrity and establishing relationships between tables.