Usually means: Combines left table, fills nulls.
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We found 5 dictionaries that define the word left join:

General (2 matching dictionaries)
  1. left join: Wiktionary
  2. left join: Dictionary.com

Computing (2 matching dictionaries)
  1. left join: Free On-line Dictionary of Computing
  2. left join: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (Left join)

noun:  (databases) Short for left outer join. [(databases) A join yielding a set of records for two tables, where all rows of the "left" table are enlisted with all rows of the "right" table, even if the join condition does not find any matching row on the "right".]

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