3.1 Layer 0 - The Core

      3.1.1 Fragments

      3.1.2 From

        3.1.2.1 Appending Queries

        3.1.2.2 Always Use the Alias!

        3.1.2.3 Query Contents

      3.1.3 Join

        3.1.3.1 Attached vs Detached Joins

        3.1.3.2 Joined Subqueries

        3.1.3.3 Join-to-Query Conversion

      3.1.4 Injections

        3.1.4.1 Aggregate Injection in Depth

        3.1.4.2 Nested Aggregates

    3.2 Layer 1 - Schema as Procedures

      3.2.1 Tables

      3.2.2 Columns

      3.2.3 Joins

        3.2.3.1 Singular Join Examples

        3.2.3.2 Plural Join Examples

        3.2.3.3 Grouped Join Examples

      3.2.4 Derived Scalars

    3.3 Layer 2 - SQL as Procedures