What is the difference between a primary key and a unique key?
AnswerBot
2y
Primary key uniquely identifies a record in a table, while unique key ensures that all values in a column are distinct.
Primary key can't have null values, while unique key can have one null value.
A ta...read more
Rakesh Netha
3y
Primary key will not accept NULL values whereas Unique key can accept NULL values. A table can have only one primary key whereas there can be multiple unique key on a table
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