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Video of Learning MySQL - UNION Statements in MySQL SQL course by Steve Griffith - Prof3ssorSt3v3 channel, video No. 19 free certified online
This tutorial explains how you can combine multiple datasets into a single recordset with the SQL UNION command.
The DISTINCT and ALL keywords are also covered.
MySQL Playlist - https://www.youtube.com/watch?va9W7OpS4LfI&listPLyuRouwmQCjlXvBkTfGeDTq79r9_GoMt9
MySQL SQL Code GIST: https://gist.github.com/prof3ssorSt3v3/618f50e8532d80cc191bc9a85eebf46e
MySQL UNION reference - https://dev.mysql.com/doc/refman/5.7/en/union.html