left join vs left outer join

1. Is left outer join same as LEFT JOIN?
2. What is the difference between left join and left outer join in mysql?
3. What is the difference between left outer join and right outer join?
4. Is a left join inner or outer?
5. What is left outer join with example?
6. What does a left outer join do?
7. IS LEFT JOIN faster than right join?
8. Why do we need left and right outer join?
9. How is full join different from left and right join?
10. Why we use left outer join in SQL?

Is left outer join same as LEFT JOIN?

Left Join and Left Outer Join are one and the same. The former is the shorthand for the latter. The same can be said about the Right Join and Right Outer Join relationship.

What is the difference between left join and left outer join in mysql?

INNER JOIN : returns rows when there is a match in both tables. LEFT JOIN / LEFT OUTER JOIN : returns all rows from the left table, even if there are no matches in the right table. RIGHT JOIN / RIGHT OUTER JOIN : returns all rows from the right table, even if there are no matches in the left table.

What is the difference between left outer join and right outer join?

Full Outer Join returns all the rows from both the table.
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Differences between Left Outer Join, Right Outer Join, Full Outer Join :

Is a left join inner or outer?

LEFT JOIN is same as LEFT OUTER JOIN - (Select records from the first (left-most) table with matching right table records.) RIGHT JOIN is same as RIGHT OUTER JOIN - (Select records from the second (right-most) table with matching left table records.) Inner join: Only show rows, when has it data from both of the tables.

What is left outer join with example?

SQL left outer join is also known as SQL left join. Suppose, we want to join two tables: A and B. SQL left outer join returns all rows in the left table (A) and all the matching rows found in the right table (B). It means the result of the SQL left join always contains the rows in the left table.

What does a left outer join do?

A left outer join returns all the values from an inner join plus all values in the left table that do not match to the right table, including rows with NULL (empty) values in the link column.

IS LEFT JOIN faster than right join?

A LEFT JOIN is absolutely not faster than an INNER JOIN . In fact, it's slower; by definition, an outer join ( LEFT JOIN or RIGHT JOIN ) has to do all the work of an INNER JOIN plus the extra work of null-extending the results.

Why do we need left and right outer join?

The only reason I can think of to use RIGHT OUTER JOIN is to try to make your SQL more self-documenting. You might possibly want to use left joins for queries that have null rows in the dependent (many) side of one-to-many relationships and right joins on those queries that generate null rows in the independent side.

How is full join different from left and right join?

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: It combines the results of both left and right outer joins. ... We have two tables with the following values.

Why we use left outer join in SQL?

A left outer join is a method of combining tables. The result includes unmatched rows from only the table that is specified before the LEFT OUTER JOIN clause. If you are joining two tables and want the result set to include unmatched rows from only one table, use a LEFT OUTER JOIN clause or a RIGHT OUTER JOIN clause.