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

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



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