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What is forieng key

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What is forieng key

Posted by Kumar Raftaar 4 years ago

CBSE > Class 10 > Information Technology (402)

1 answers

Gaurav Seth 4 years ago

A foreign key is a key used to link two tables together. This is sometimes also called as a referencing key.

A Foreign Key is a column or a combination of columns whose values match a Primary Key in a different table.

The relationship between 2 tables matches the Primary Key in one of the tables with a Foreign Key in the second table.

If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).

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CBSE > Class 10 > Information Technology (402)

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CBSE > Class 10 > Information Technology (402)