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What Is A Primary Key Constraint? |
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Answer» PRIMARY key constraint is imposed on the column data to avoid NULL values and duplicate values. Primary Key=Unique + Not Null. Example: SOCIAL SECURITY number, BANK account number, bank routing number Primary key constraint is imposed on the column data to avoid null values and duplicate values. Primary Key=Unique + Not Null. Example: social security number, bank account number, bank routing number |
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