Question

This helps to maintain unique records in the table.​

Answer 1

Answer:

We have a statement that says that there is something which helps to maintain unique records in the table and the answer for that is Primary Key.

Explanation:

Primary Key helps to maintain unique records in the table. This is the key which has the attribute in finding rows of the table. If we identify the column or the group of the columns that has the primary key and that is defined as the Primary Key for the table. We can also have one or more Unique Keys on the same table. But there is some difference between the primary key and unique keys and that is a table can have only one Primary Key in which there is no null values but a table can have more than one Unique Keys in which nulls are allowed but the condition is this when the rdbms platform permits this thing on the table.

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