define primary keys and mention its importance
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A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. ... If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).
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A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. ... If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).
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