In this article, you will learn how to manage index or constraint dependencies or changes in SQL, using some examples and best practices. Indexes are data structures that allow faster retrieval of ...

In SQL we have three four major constraints - 'UNIQUE', 'FOREIGN KEY', 'CHECK' and 'NOT NULL'. Also we have non-standard ON CONFLICT clause, which propose what kind ...

Before you write any SQL test case, you need to define what you want to test and why. For complex queries, you may have multiple test objectives, such as verifying the correctness of the output ...