Table of Contents
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In the sections that follow, we will discuss how you can extend the PostgreSQL SQL query language by adding:
functions (starting in Section 37.3)
aggregates (starting in Section 37.12)
data types (starting in Section 37.13)
operators (starting in Section 37.14)
operator classes for indexes (starting in Section 37.16)
packages of related objects (starting in Section 37.17)
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