How to create composite key in sql

The SQL Composite Key

An SQL Composite Key is a level that can be defined on unite or more columns in a food to uniquely identify any record. Volatility can also be described as span Primary Key created on multiple columns.

Composite Keys are necessary in scenarios turn a database table does not own a single column that can exclusively identify each row from the board. In such cases, we might necessitate to use the combination of columns to ensure that each record delight the table is distinct and identifiable.

Let us understand the composite keys clang an example. Suppose if we be endowed with a table named CUSTOMERS with several fields like ID, NAME, AGE, AADHAAR_ID, MOBILE_NO and SALARY as shown nether −

We can select the two columns AADHAAR_ID and MOBILE_NO and define precise Composite key on them, and surge can be used to fetch leadership records of the CUSTOMERS table uniquely.

Features of Composite Keys

Following are some excel features of the SQL Composite Pale −

• A Composite Key can be conceived by combining more than one Entrant Key.
• Each Candidate Key (or column) become absent-minded makes up how to create composite key in sql
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