A ____ key is used as a unique ____ to quickly parse data within the ____. A table cannot have more than ____ primary key. Primary key is used to ____ data uniquely therefore two rows can't have the same primary key. It ____ be null. On the other hand, ____ key is used to maintain relationship between two tables. A primary key is a ____ (or set of ____) in a table that uniquely identifies each ____ in the table. Only one primary key is allowed in a ____. A ____ key refers to the primary key in another table. It is used to establish a link between the ____ tables. Unlike a primary key, a table ____ have more than one foreign key. Primary key values ____ be deleted from the parent table. Values of foreign key ____ be removed from the child table. The primary key is a ____ index.

Primary key vs. foreign key

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