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A primary key is a unique identifier used to distinguish a database table entry from other entries. Creating a database table requires assigning at least one column to store the primary keys. A primary key cannot be a nu... More »

In database design, a primary key is important because it serves as a unique identifier for a row of data in a database table. A primary key makes it convenient for a user to add, sort, modify or delete data in a databas... More »

Primary keys are used to uniquely identify a row in a database table; no two rows can have the same primary key. Identification numbers are often used as primary keys. Any field that is not necessarily unique, such as a ... More »

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The primary feature of a relational database is its primary key, which is a unique identifier assigned to every record in a table. An example of a good primary key is a registration number. It makes every record unique, ... More »

In database design, a primary key is important because it serves as a unique identifier for a row of data in a database table. A primary key makes it convenient for a user to add, sort, modify or delete data in a databas... More »

Primary keys are used to uniquely identify a row in a database table; no two rows can have the same primary key. Identification numbers are often used as primary keys. Any field that is not necessarily unique, such as a ... More »

A foreign key is a column (or group of columns) in a relational database table that provides a link between data in two tables. A foreign key in one table corresponds to a primary key in another table. More »