SQL

Serving map clusters to a mobile app can cause a significant performance bottleneck. Fortunately, it's a problem that can be solved with this caching strategy.

Indexes and partitioning can help with SQL performance, but they're not cure-alls. Through everyday examples of date range and LIKE queries, find out how to "think like an RDBMS" to make yours run faster.

Sorting a table can make some queries faster—but the maintenance cost is untenable. Enter real database indexes and their most common implementation structure: the B-tree.

Properly used, an SQL database index can be so effective that it might seem like magic. But the following series of exercises will show that underneath, the logic of most SQL indexes---and wielding them correctly---is quite straightforward.

Migrating in either direction between Microsoft SQL Server and Oracle Database? Code migration tools, public synonyms, and change management are important to keep in mind.

Migrating in either direction between Microsoft SQL Server and Oracle Database? This round of pitfalls to avoid includes coverage of sequences, identity columns, and filtered indexes.

Migrating in either direction between Microsoft SQL Server and Oracle Database? There are some significant pitfalls to be aware of...

SQL window functions are calculation functions similar to aggregate functions but, unlike normal aggregate functions like "group by," have access to individual rows and can even add some of their attributes into the result set. In this article, Toptal Freelance SQL Developer Neal Barnett explains the benefits of SQL functions, describes when you’d use them, and gives you real examples to help with the concepts.

Data warehouses aren’t exactly a new concept, but industry demand for data science services, coupled with the rise of AI and machine learning, is making them more relevant than ever. In this post, Toptal Data Warehouse Developer Chamitha Wanaguru outlines three basic principles you need to keep in mind when developing a new data warehouse.