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MySQL Interview Questions and Answers

Ques 6. What Is Row?

Ans. A row is a unit of data with related data items stored as one item in one column in a table.

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Ques 7. What Is Primary Key?
Ans. A primary key is a single column or multiple columns defined to have unique values that can be used as row identifications.
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Ques 8. What Is Foreign Key?
Ans. A foreign key is a single column or multiple columns defined to have values that can be mapped to a primary key in another table.
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Ques 9. What Is Index?
Ans. An index is a single column or multiple columns defined to have values pre-sorted to speed up data retrieval speed.
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Ques 10. What Is View?
Ans. A view is a logical table defined by a query statement.
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