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CREATE TABLE - Structured Query Language
Alternate keys - RDBMS - SQL
328    Arnab De    21/11/2021

In a relation or table can have more than one choice of primary key, but only one of them set as a primary key. All the others keys which are able to declared as primary key are called an Alternate Key.  That is all alternate key of a table can uniquely identify every tuple in that relation or table.

Lets consider, a relation called emp

Emp
Emp_SSN Emp_No Emp_Name
1234544434 E-001 Pradipta Pal
5345232444 E-002 Abhijit Ganguly
4645673422 E-003 Suman Banerjee
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In the above table Emp_SSN  and Emp_No both can identify a student uniquely. We can declare those fields as a primary key. That is why those fields are known as alternate keys

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CREATE TABLE - Structured Query Language
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Author Details
Arnab De
I have over 16 years of experience working as an IT professional, ranging from teaching at my own institute to being a computer faculty at different leading institute across Kolkata. I also work as a web developer and designer, having worked for renowned companies and brand. Through tutorialathome, I wish to share my years of knowledge with the readers.
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