devxlogo

Foreign Keys

Foreign Keys

Question:
How do I temporarily disable foreign keys in a table, insert more rows, and then enable them again?

In particular, I need to know about syntax and what the code would be like.

Answer:
You need to disable the mechanism that enforces integrity, the CONSTRAINT against the column housing the foreign key. You do this by using the ALTER TABLE command like this:

ALTER TABLE MyTable DROP CONSTRAINT MyConstraintName

To re-enable the constraint after the operation, ALTER the table again. The particular syntax depends on what you are trying to re-establish; it’s different for PRIMARY KEY, FOREIGN KEY, and DEFAULT&#151not to mention the different flavors of indexes, etc.

Take a look in Books On Line for examples of the particular constraint need.

See also  How IoT Tech Will Transform Logistics
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist