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Author Martin Kleppmann helps you navigate the diverse data landscape by examining the pros and cons of various technologies for processing and storing data. Software keeps changing, but the fundamental principles remain the same. With this book, software engineers and architects will learn how to apply those ideas in practice, and how to make full use of data in modern applications.

Most real-world applications store their data in databases. Most of their databases are relational. PostgreSQL is one of the most-used relational databases. It is an open source software that you can download from https://www.postgresql.org To access data in a relational database we use SQL (Structured Query Language). If you are new to SQL, and want to use SQL in PostgreSQL, this is the book of choice. It is a practical book, teaching you SQL step-by-step using examples. If you take a glance at the table of contents, you will appreciate the comprehensive coverage of the book. When you ...

PostgreSQL is an open relational database. In PostgreSQL you can have a query with CUBE clause. A cube is an aggregated row. A query with a CUBE clause returns (generates) a complete set of cubes; complete in the sense that the cubes generated cover all the possible combinations of all columns specified (listed) under the WITH clause. In this book you will learn the WITH clause and usages of cubes, known as OLAP queries.

Knowing how to craft SQL queries and navigate your way around a database is an essential skill if are a Database Administrator, System Administrator, or Programmer. This book guides you step-by-step by teaching you how to create databases, populate those databases with data, extract just the data you need, and much more.

A composite type is a collection of columns. In postgreSQL database you create a composite type using a CREATE TYPE statement. Once created, you can use a composite type the same way as a primitive datatype, for example, as the datatype of a column. In this practical book you will learn how to create, use, and maintain composite type, by examples.