Understanding Relations
Understand how PostgreSQL defines and handles relations as sets of data with common properties. Learn about composite data types, the FROM clause mechanics, and how joins produce new relations. This lesson helps you grasp relational algebra concepts and how the query planner optimizes SQL operations for efficient database management.
We'll cover the following...
We'll cover the following...
As usual, the PostgreSQL documentation provides us with some information here in its section entitled the FROM Clause:
Note: A table reference can be a table name (possibly schema-qualified) or a derived table such as a subquery, a ...