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What is the difference between Left Join and Left Outer Join?
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There really is no difference between a LEFT JOIN and a LEFT OUTER JOIN. Both versions of the syntax will produce the exact same result in PL/SQL. Some people do recommend including outer in a LEFT JOIN clause so it's clear that you're creating an outer join, but that's entirely optional.
Again, if we perform a left outer join where date = date, each row from Table 5 will join on to every matching row from Table 4. However, in this case, the join will result in 4 rows of duplicate dates in the joined DataSet (see Table 6).
Left Outer Join: Returns all the rows from the LEFT table and matching records between both the tables. Right Outer Join: Returns all the rows from the RIGHT table and matching records between both the tables.
LEFT JOIN: returns all rows from the left table, even if there are no matches in the right table. RIGHT JOIN: returns all rows from the right table, even if there are no matches in the left table. FULL JOIN: combines the results of both left and right outer joins.
They are the same thing in MySQL. A LEFT JOIN is a synonym or shorthand for LEFT OUTER JOIN.
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There is none. The keyword OUTER is optional. They mean the same.
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