MySQL JOIN / LEFT JOIN


https://www.codeproject.com/kb/database/visual_sql_joins.aspx

join_leftjoinfrom:
Chapter 14
The Language of SQL, 2nd Edition
By Larry Rockoff
Published Jul 27, 2016 by Addison-Wesley Professional
http://www.informit.com/store/language-of-sql-9780134658254

As in all computer languages, there is frequently more than one way to specify
any desired objective.
p. 1

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