What is primary and foreign key with example?

Question

A primary key is used to ensure data in the specific column is unique. A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It uniquely identifies a record in the relational database table. 28 мар. 2020 г.

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 and example?

A primary key is a column -- or a group of columns -- in a table that uniquely identifies the rows of data 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.

What is primary & 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.

What is foreign key with example in DBMS?

In simpler words, a foreign key is a set of attributes that references a candidate key. For example, a table called TEAM may have an attribute, MEMBER_NAME, which is a foreign key referencing a candidate key, PERSON_NAME, in the PERSON table.

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