Sunday, June 16, 2013

Notes On JOIN - MySQL


  • If your INNER join is returning too few values and duplicates, you're probably using the wrong kind of join. Try a LEFT join.
  • INNER JOIN is the same as JOIN
  • http://i.stack.imgur.com/GbJ7N.png (diagram explaining joins)
  • LEFT JOIN is used - this will return ALL rows from Table1, regardless of whether or not there is a matching row in Table2. 

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