What is primary key and its uses?

Question

A primary key is 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. A table cannot have more than one primary key. 14 авг. 2020 г.

What are the uses of primary key?

A primary key is the column or columns that contain values that uniquely identify each row in a table. A primary key is needed: To extract or archive data from a table that is visited more than once during a process (for example, a child table that has two or more parent tables referenced in the Access Definition).

What is the use of primary key and foreign key?

A primary key is used to assure the value in the particular column is unique. The foreign key provides the link between the two tables. Find out the major difference between primary key and unique key.

Expert · Answer

A primary key is the column or columns that contain values that uniquely identify each row in a table. A primary key is needed: To extract or archive data from a table that is visited more than once during a process (for example, a child table that has two or more parent tables referenced in the Access Definition).

Expert · Answer

A primary key is used to assure the value in the particular column is unique. The foreign key provides the link between the two tables. Find out the major difference between primary key and unique key.

What is primary key and its uses?

What are the uses of primary key?

What is the use of primary key and foreign key?

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