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PostgreSQL 11.3 Documentation. The PostgreSQL Global Development Group. Page 2. PostgreSQL 11.3 Documentation. The PostgreSQL Global Development Online Version, PDF Version Please see the manual archive for documentation for older releases. The DocBook SGML source for the manuals is available as This tutorial shows you how to use PostgreSQL SUM function to calculate the sum of values or distinct values.postgres. taggings_count: 5. Rails and hstore. class CreateProfiles < ActiveRecord::Migration[5.1] www.postgresqltutorial.com/postgresql-sum-function/. In particular, sum of no rows returns null, not zero as one might expect, and array_agg returns null rather than an empty array when there are no input rows.