Three-Valued Logic
Explore the concept of three-valued logic in PostgreSQL and its impact on SQL null handling. Understand how nulls differ from typical programming null values, how they affect SQL comparisons, and how operators like 'is distinct from' help manage null values in queries.
We'll cover the following...
We'll cover the following...
Given its relational theory background, SQL comes with a special value that has no counterpart in a common programming language: null. In Python, we have None; in PHP, we have null; in C, we have nil; and about ...