Chapter 4: Common Language Elements

Table of Contents

Constants
SQL Operators
Conditional Expressions
NULL in Expressions
Subqueries

Assertions
Comparison Predicates
Existential Predicates
Quantified Subquery Predicates

This chapter covers the elements that are common throughout the implementation of the SQL language—the expressions that are used to extract and operate on assertions about data and the predicates that test the truth of those assertions.