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How can a Foreign Key and a Primary Key interact with each other?
Wiki User
∙ 8y ago
In some database systems, A Foreign Key that is set on one column (the child column ) has to point to another column (the parent column ) that is indexed. The parent column could be a primary key, since a primary key creates an index. Primary keys also keep values in the parent column unique, which can ensure unique records in the parent column's table; having a unique key on the child column can further enforce unique data that links with the unique records in the parent column .
Wiki User
∙ 8y ago
A foreign key in a table references the primary key in another table, creating a relationship between the two tables. This ensures referential integrity, meaning that values in the foreign key column must exist in the primary key column. This relationship allows data to be linked and maintained consistently between the tables.
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it interact by kissing
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What is study of how living things interact with each other and their environment?
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it is by the gravity
How do cultures interact with each other?
by waving
