difference between primary key and unique key

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Difference between Key, Primary Key, Unique Key and Index in MySQL

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INSERT ... ON DUPLICATE KEY (do nothing)

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How to remove unique key from mysql table

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How add unique key to existing table (with non uniques rows)

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MySQL - Meaning of "PRIMARY KEY", "UNIQUE KEY" and "KEY" when used together while creating a table

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#1062 - Duplicate entry '' for key 'unique_id' When Trying to add UNIQUE KEY (MySQL)

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MySql - Is primary key unique by default?

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MySQL - Make a pair of values unique

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MySQL: ALTER IGNORE TABLE ADD UNIQUE, what will be truncated?

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make text column as unique key

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Is it bad to use user name as primary key in database design?

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