Rows can be removed from a table using the DELETE command. Suppose you are no longer interested in the weather of Hayward. Then you can do the

You can update existing rows using the UPDATE command. Suppose you discover the temperature readings are all off by 2 degrees after November 28

To retrieve data from a table, the table is queried. An SQL SELECT statement is used

This chapter provides an overview of how to use SQL to perform simple operations. This tutorial is only intended to give you an introduction

Like most other relational database products, PostgreSQL supports aggregate functions. An aggregate function computes

Thus far, our queries have only accessed one table at a time. Queries can access multiple tables at once, or access the same table in such a way that multiple rows of the table

The INSERT statement is used to populate a table with rows:

You can create a new table by specifying the table name, along with all column names and their types:

PostgreSQL is a relational database management system (RDBMS). That means it is