The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/11/tutorial-join.html
Description:
The example of self join shows two resulting records.
I have checked the input data.
There are three output records with lower lo and higher high temperatures
We seem to be missing, in the answer, a third record:
( (San Francisco, 46, 50) , (Hayward, 54, 37 ))