What is the use of primary key class 8?

Question

A Primary key is a check on the table that uniquely identifies each record on a table. It does not contain any duplicate data. A table can have only one Primary key.

What is the use 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 in computer class 8?

Answer: Primary key is a field that uniquely identifies each record in a table. For example, in a school database, the Roll Number of each student uniquely identifies each student. A Primary key does not allow Null Values and must always have a unique value.

What is the use of primary key and foreign key?

Primary key is used to identify data uniquely therefore two rows can't have the same primary key. It can't be null. On the other hand, foreign key is used to maintain relationship between two tables.

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

Answer: Primary key is a field that uniquely identifies each record in a table. For example, in a school database, the Roll Number of each student uniquely identifies each student. A Primary key does not allow Null Values and must always have a unique value.

Expert · Answer

Primary key is used to identify data uniquely therefore two rows can't have the same primary key. It can't be null. On the other hand, foreign key is used to maintain relationship between two tables.

What is the use of primary key class 8?