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CREATE TABLE - Structured Query Language Candidate key - RDBMS
Super key - RDBMS - SQL
77    Arnab De    21/11/2021   

Super key

A set or collection of one or more attributes or fields (column), which uniquely identify a row or tuple in a relation or table is known as super key.

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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The above table has many super key s and those super keys are able to uniquely identify a tuple of the employee table.

  • {Emp_No}
  • {Emp_SSN}
  • {Emp_SSN, Emp_Name}
  • {Emp_SSN, Emp_No}
  • {Emp_No, Emp_Name}
  • {Emp_SSN, Emp_No, Emp_Name}
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CREATE TABLE - Structured Query Language Candidate key - RDBMS
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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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