If you are working with SQL DB2, you may need to create tables that have primary and foreign keys to enforce data integrity and establish relationships between different entities.

Modern relational database features in PostgreSQL include complex queries, foreign keys, triggers, updatable views, ... To execute SQL commands and queries, add a semicolon (;) ...

Real-world relational databases have tables that contain fields, constraints, and triggers, and tables are related through foreign keys. SQL is used to declare the data to be returned, and a SQL ...

The workaround suggested in the link to mysql bug report is to recreate a foreign key index in the same mysql statement right after a unique index is dropped. Unfortunately, the way the dropUnique() ...