Databases
This section contains posts related to databases.
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Indexes in databases. Types of indexes.
Indexes in databases are used to speed up search and data retrieval. They work similarly to pointers in a book, allow...
What is a transaction? What are the main properties of tr...
In the world of databases and programming, the term "transaction" plays a key role. It describes a sequence of op...
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JOIN: LEFT/RIGHT/INNER/OUTER
SQL Joins SQL JOIN is an operation that allows combining data from multiple tables based on related columns. Ma...
SQLBolt
SQLBolt - a series of interactive lessons and exercises designed to help you quickly learn SQL right in your browser....
What is PostgreSQL?
PostgreSQL is a DBMS that uses a relational model for its databases and supports the standard SQL query language. Po...