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For the purposes of this discussion, row_number() is just as good as rank(), and its behavior is easier to understand and describe. So let's switch the examples to using row_number(). Along the way to checking the results given in the tutorial, I found it helpful to extract the empsalary table we use in the regression tests, which is evidently the same data that was used to make these results. So I shoved that into advanced.source to improve the coverage of that file a little. (There's still several pages of the tutorial that are not included in it, but at least now 3.5 Window Functions is covered.) Suggested-by: "David G. Johnston" <david.g.johnston@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/173737973383.1070.1832752929070067441@wrigleys.postgresql.org
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
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General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.