Learn how to create, drop, and manage a unique constraint using SQL and some best practices to follow. A unique constraint prevents data duplication and ensures data integrity.

MySQL doesn't support ALTER TABLE .. DROP CONSTRAINT #4261 Open lukaseder opened this issue May 1, 2015 · 0 comments Labels E: All EditionsT: Defect Milestone Version 3.19.0 Member lukaseder commented ...

The new operation is in addition to the existing `drop_constraint` operation which only drops single column constraints. This old operation type is preserved for backwards compatibility but will be ...

I wouldn't drop and add a foreign key just to modify data. In Oracle and MySQL you can temporarily disable foreign key checks.

The number of transistors per chip still steadily increases for each technology node generation. Fabrication processes and computing architectures have enabled the integration of hundreds of cores in ...