SQL is still the connective tissue of every modern data stack—from cloud warehouses to mobile apps. Recruiters know it, too: employer demand for SQL skills grew 46% year-over-year, according to labour ...

In some cases, performance issues can arise with SELECT statements. The issue is that number of rows tends to grow rapidly as more tables are joined, as result set is de-normalized and contains a lot ...

Pitfall: One of the most common mistakes of all is to forget to add proper indexing. Without indexes, SQL queries will eventually slow down over time and with increasing database size. Solution: Make ...

Not all SQL statements are migratable. Different databases have different functionalities. When the syntax of certain does not have their counterpart in another database, migration becomes impossible.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

SQL injection has been a major security risk since the early days of the internet. Find out what's at risk, and how cybersecurity pros can defend their organizations. Few things terrify IT security ...

Abstract: This paper proposes combining the mutation testing technique with evolutionary computing to improve the test data applied to SELECT instructions. From a heuristic perspective, this approach ...