Difference Between Left and Right Join (With Table)

Join is a typical moniker and command element that will appear from time to time while dealing with SQL. The join clause facilitates the combining of records from various tables in data collection. The join generates a table that may be used alone or combined with one another. It is thus recommended to comprehend these joins and the distinctions between them to determine the specific join as well as whether right or left should be chosen in unique cases.

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SELECT column_name(s)
FROM table1
RIGHT JOIN table2
ON table1.column_name = table2.column_name

Main Differences Between Left Join and Right Join

  1. A left join exhibits all rows from the table’s left side, whereas a right join exhibits all rows from the table’s right side.
  2. A left join is also known as left outer join whereas the right join is also known as right outer join.
  3. The left join contains unmatched records from the left table whereas the right join consists of the unmatched data from the right table.
  4. The left join phrase is more commonly used over the right join phrase.
  5. The formula for left join is all the matching records + unmatched records of the left table whereas the formula for right join is all the matching records + unmatched records of the right table.

Conclusion

When interacting with these different joins, it is vital to know that in a left outer join, all the columns from the left of the table are visible in the database. The results appear regardless of whether matched columns are available in the correct table. It makes no difference whether you use the left or right outer join because the consequences are the same. The process information by a right outside join is the same as that provided by a left outer join.

References

  1. https://www.tutorialspoint.com/sql/sql-left-joins.htm#:~:text=The%20SQL%20LEFT%20JOIN%20returns,matches%20in%20the%20right%20table.&text=This%20means%20that%20a%20left,of%20no%20matching%20join%20predicate.
  2. https://mode.com/sql-tutorial/sql-right-join/#:~:text=Right%20joins%20are%20similar%20to,names%20in%20a%20LEFT%20JOIN%20.

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