Technically, it returns the result set of a query without WHERE-Clause. As per SQL concern and advancement, there are 3-types of joins and all RDBMS joins can be achieved using these types of …

Sep 2, 2008 · Inner joins (or what is the default when using only "join") is a join where only the elements that match the criteria are present on both tables. The "outer" joins are the same as the inner join …

FULL JOIN: combines the results of both left and right outer joins. The joined table will contain all records from both the tables and fill in NULLs for missing matches on either side. SELF JOIN: joins a …

Dec 22, 2012 · SELECT A.Colour, B.Colour FROM A LEFT OUTER JOIN B ON A.Colour = B.Colour SQL Fiddle Outer Joins are logically evaluated in the same way as inner joins except that if a row …

May 22, 2023 · Inner joins only return a row where there is a match on the join condition, whereas, a LEFT OUTER join returns the same rows returned by an INNER join, as well as a ROW for any rows …

If a filter enters in a JOIN condition functionally (i.e. it is an actual join condition, not just a filter), it must appear in the ON clause of that join. Worth noting: If you place it in the WHERE clause instead, the …

Jun 2, 2016 · No-one should ever be using implicit joins any more. They're harder to read, maintain, etc, and in some cases they actually don't work correctly and have been deprecated.

Mar 8, 2012 · Most joins using the JOIN keyword are flattened into simple joins, so the optimizer chooses their join order. The optimizer does not choose the join order for outer joins; it uses the …

Jan 2, 2009 · 21 JOINs: INNER JOIN = JOIN OUTER JOIN LEFT OUTER JOIN = LEFT JOIN RIGHT OUTER JOIN = RIGHT JOIN FULL OUTER JOIN = FULL JOIN CROSS JOIN Self- JOIN: This is not …

You can also use Profiler to actually run the queries multiple times and get the differnce. I would not expect these to be so horribly different, where you can get get real, large performance gains in using …