PostgreSQL is a free, open-source SQL database. It’s an alternative to MySQL and is used by small projects as well as larger companies.
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A range of articles and other resources to get you started with PostgreSQL.
A list of definitive guides on many of the SQL keywords.
Further Learning: Objects
Learn all about the different objects available in PostgreSQL.
More features and topics in PostgreSQL.
Interview Questions and Answers
A list of 69 interview questions and answers, plus interview tips.
Transactions and Isolation Levels
An explanation of transactions in SQL and what isolation levels are.
A collection of articles detailing how to do common tasks in SQL queries.
A list of guides and collations of different tools for database developers and administrators.