Bokep
- Viewed 167k times16edited May 23, 2017 at 12:26
When using LEFT JOIN or RIGHT JOIN, it makes a difference whether you put the filter in the WHERE or into the JOIN.
See this answer to a similar question I wrote some time ago: What is the difference in these two queries as getting two different result set?
In short:
if you put it into the WHERE clause (like you did, the results that aren't associated with that computer are completely filtered out
if you put it into the JOIN instead, the results that aren't associated with that computer appear in ...
Content Under CC-BY-SA license How To Join With A WHERE Clause In SQL - Data Class
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