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MySQL Interview Questions and Answers

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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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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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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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An index is a single column or multiple columns defined to have values pre-sorted to speed up data retrieval speed.