What is the method of specifying a primary key in a schema description?(a) By writing it in bold letters(b) By underlining it using a dashed line(c) By writing it in capital letters(d) By underlining it using a bold lineThe question was posed to me at a job interview.This intriguing question comes from Introduction to the Relational Model in chapter Introduction to Relational Model and Sql of RDBMS

What is the method of specifying a primary key in a schema description

1.	What is the method of specifying a primary key in a schema description?(a) By writing it in bold letters(b) By underlining it using a dashed line(c) By writing it in capital letters(d) By underlining it using a bold lineThe question was posed to me at a job interview.This intriguing question comes from Introduction to the Relational Model in chapter Introduction to Relational Model and Sql of RDBMS
Answer» The correct option is (d) By UNDERLINING it using a bold line The best EXPLANATION: We can SPECIFY a primary key in SCHEMA description by underlining the respective attribute with a bold line.

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