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MySQL - does primary key have to be unique?

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Does the primary key have to be unique in MySQL?

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Answered by:
Dirask Community
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Yes, the primary key is always unique in MySQL and every other SQL.

Note:

  • you don't have to explicitly define it as UNIQUE,
  • there can only be one primary key for each table, and it can┬ánever be a┬áNULL value.
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