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

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

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.

Is Left join and outer join same?

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.

Why we use left outer join in SQL?

A left outer join is a method of combining tables. 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. …

What is the difference between join and left join in SQL?

The LEFT JOIN statement is similar to the JOIN statement. The main difference is that a LEFT JOIN statement includes all rows of the entity or table referenced on the left side of the statement. A simple JOIN statement would only return the Authors who have written a Book.

When to use left join vs Right join?

The LEFT JOIN includes all records from the left side and matched rows from the right table, whereas RIGHT JOIN returns all rows from the right side and unmatched rows from the left table….LEFT JOIN vs. RIGHT JOIN.

LEFT JOIN	RIGHT JOIN
It is also known as LEFT OUTER JOIN.	It is also called as RIGHT OUTER JOIN.

IS LEFT join same as left outer join mysql?

In SQL, what is the difference between a left join and a left outer join? There is actually no difference between a left join and a left outer join – they both refer to the exact same operation in SQL.

When should we use LEFT join?

A left join is used when a user wants to extract the left table’s data only. Left join not only combines the left table’s rows but also the rows that match alongside the right table.

When to use right vs left join?

Is Left join more efficient than inner 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.

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

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

Left Outer Join	Right Outer Join	Full Outer Join
Unmatched data of the right table is lost	Unmatched data of the left table is lost	No data is lost