self join

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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 ))
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