SQL articles

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Window functions in SQL

Window functions are one of another SQL features that we'll probably discover during the work with data-oriented application. They can be also used in more classical programs though. Continue Reading →

Hierarchical queries

SQL hides for the most of its daily users a lot of interesting and powerful functions that though are not used very frequently. One of them are hierarchical queries. Continue Reading →

Correlated subqueries

Even though the RDBMS is more and more completed (replaced?) by NoSQL solutions, it still remains an important piece of the data processing. It's even more true with the distributed databases as BigQuery supporting SQL standards so the correlated subqueries. But they're also implemented in other Big Data engines as Spark SQL or more classical ones as PostgreSQL. Continue Reading →