January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Working with data
The Chapter 5, SQL Language and Chapter 6, Advanced Query Writing were dedicated to the other part of SQL: data manipulation language (DML). It's essential to know SQL when working with any relational database, not only PostgreSQL. This language is used to create, modify, and remove data from a database. And of course, it's used to retrieve data. The power of PostgreSQL comes from its ability to understand SQL queries of any complexity and execute them efficiently. But even the best database algorithms can't know the data better than the people who created it, therefore it is very important to know SQL and be able to compose good queries.
In many cases, the capabilities of SQL are not enough. Sometimes, SQL's declarative ...
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