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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
src/tutorial/README tutorial ======== This directory contains SQL tutorial scripts. To look at them, first do a % make to compile all the scripts and C files for the user-defined functions and types. (make needs to be GNU make --- it may be named something different on your system, often 'gmake') Then, run psql with the -s (single-step) flag: % psql -s From within psql, you can try each individual script file by using psql's \i <filename> command.