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Then, what is an outer join SQL?

In SQL, a join is used to compare and combine — literally join — and return specific rows of data from two or more tables in a database. An inner join finds and returns matching data from tables, while an outer join finds and returns matching data and some dissimilar data from tables.

Secondly, what is the syntax for a left outer join? The LEFT JOIN keyword returns all records from the left table (table1), and the matched records from the right table (table2). The result is NULL from the right side, if there is no match.

Thereof, what is difference between left join and left outer join in SQL?

In SQL, the left join returns all the records from first table and matched records from second table. If there is no match from second table then only records from first table are returned. Basically there is no difference in left join and left outer join. Left outer join also returns same results as left join.

What is difference between left and right outer join?

The key difference between a left outer join, and a right outer join is that in a left outer join it's the table in the FROM clause whose all rows are returned. Whereas, in a right outer join we are returning all rows from the table specified in the join clause.