FK Abbreviation

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Popular abbreviations of FK:

Searching for FK abbreviation / FK full form leads to different results in different categories. The below table illustrates the popular acronyms among them.

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What does FK mean?

The Foreign key is a source or set of attributes used to link the two tables. It permits the developer to retain referential integrity throughout the database.

These foreign keys are often referred to as the primary key for other tables. The FK to a greater extent prevents the end-users from concluding any errors. And overall helps in improving the performance of an operation through the pull of data from two or more tables connected via indexed foreign keys.

What is known by the FK constraints?

To set a relationship between the columns of two distinct tables, there must be some criteria. So, these FK constraints are the rules needed for adding the FK to a table. These FK constraints ensure that the link between the two tables does not break. However, there is one most applied rule that the data entered for the table a should also exist for table b.

Referential actions associated with FK.

• The cascading delete happens when the parent table along with the child’s foreign key columns table gets deleted.
• If the referenced row gets deleted from the parent table then the FK values from the reference row are set to null and which maintains the referential integrity.
• The referential actions generally are applied as triggers.
• Restrict is the referential action normally related to the foreign key.

Is there any difference between the primary and foreign keys?

There are subsequent differences between a primary key and a foreign key.

• For a primary key, it ensures that the value for the particular column is unique. And as opposed to that, the foreign keys are a group or column consisting of a relational database table. Its main purpose is to establish the link between the values of the two tables.
• The primary keys column does not permit more than one unique key for the table. But there can be more than one foreign key in a table.
• There can’t be any thanks constraints for the case of the primary key. But for FKs, it sometimes has duplicate values.