What is forieng key

1.	What is forieng key
Answer» 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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