What is key How many types of key?

What is key and its types?

A key refers to an attribute/a set of attributes that help us identify a row (or tuple) uniquely in a table (or relation). A key is also used when we want to establish relationships between the different columns and tables of a relational database.

What are keys?

A key is a field, or combination of fields, in a database table used to retrieve and sort rows in the table based on certain requirements. Keys are defined to speed up access to data and, in many cases, to create links between different tables.

How many types of keys are there?

The five types of keys on a keyboard are alphabet keys, number keys, special keys, function keys, and navigation keys.

What are five types of keys?

Using your keyboardTyping (alphanumeric) keys. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter.Control keys. These keys are used alone or in combination with other keys to perform certain actions. ... Function keys. ... Navigation keys. ... Numeric keypad.