What is primary key and example?

Question

A primary key is a column -- or a group of columns -- in a table that uniquely identifies the rows in that table. For example, in the table below, CustomerNo, which displays the ID number assigned to different customers, is the primary key. CUSTOMERS. CustomerNo. 16 дек. 2020 г.

Which is the best example of a primary key?

Examples of Primary Key Valuesan automatically generated number.social security number.an email address (but only if two users can't share the same email address)vehicle identification number.driver licence number.some other special code that is unique to each record.What is a Primary Key? - Database.Guide

What is primary key and foreign key with example?

Primary KeyForeign KeyPrimary key is used to uniquely identify a rowForeign key is used to connect two tables or maintain relationship between themA table can have only have one primary keyA table can have multiple foreign keys

What is primary key in SQL with example?

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values.

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