a2zinterviews

21.	What is a Flat–File database?
	A database file that consists of a single data table is a Flat–File database. It can be quite useful for certain single user or small-group situations, especially for maintaining lists such as address lists or inventories.

22.	What is a Primary key?
	A primary key is a key that uniquely identifies a record in a database table. Eg., Emp. No's a primary key that uniquely identifies an employee record.

23.	What is a key in a Relational database?
	In a relational database, a primary key can consists of one or more fields. It uniquely identifies a record in a database table.

24.	What is meant by Filtering?
	There are times when viewing the entire table is unwidely. Using a filter is a way of limiting the information that appears on screen. Filters are a feature for displaying and browsing a selected list or subset of records from a table. The visible records satisfy the condition that the user sets. Those that do not satisfy the condition are hidden.