Foreign key in DBMS
What do you understand by the term foreign key in DBMS, and why is it employed for?
Expert
A foreign key is employed to establish relationships among relations in the relational model. Technically, a foreign key is a column (or columns) emerging in one relation which is (or are) the primary key of any other table. Though there might be exceptions, the values in the foreign key columns generally must correspond to values existing in the setup of primary key values. This correspondence requirement is made in a database employing a referential integrity constraint on the foreign key.
What is meant by the Data warehouse?
Consider a MOVIE database in which data is recorded about the movie industry. The data requirements are summarized as follows: ¦ Each movie is identified by title and year of release. Each movie has a length in minutes. Each has a production company, and each is classified under one or more genre
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