What is a primary key?
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Answer:
primary key is unique no null constraint for dbms
Explanation:
It works as reference key for a table in dbms
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Primary key : A attribute from candidate keys, Than used to Uniquely identify the table records.It should Unique, Not Null,
Should not update frequently. It is also a special relational database table column (or combination of columns) designated to
uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table.
primary key's main features are:
It must contain a unique value for each row of data.
Should not update frequently. It is also a special relational database table column (or combination of columns) designated to
uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table.
primary key's main features are:
It must contain a unique value for each row of data.
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