INTERVIEW QUESTIONS DATABASE MYSQL DETAILS

Question: Explain about primary keys?

Answer: MYSQL allows only one primary key. This primary key can be used on multiple tables. There are many rules which should be followed such as it shouldn’t be null and it can never change. Primary key assigned should be unique it cannot be matched with any other keys.

MYSQL allows only one primary key. This primary key can be used on multiple tables. There are many rules which should be followed such as it shouldn’t be null and it can never change. Primary key assigned should be unique it cannot be matched with any other keys. Source: CoolInterview.com

a primary should have unique values.
a primary does not contain null values.
a primary key has clustred index
Source: CoolInterview.com

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