Hana Outer Join4/24/2021
If you want to learn about SQL INNER JOIN, check it out the SQL INNER JOIN tutorial.
Hana Outer Join Full Outer JoinThere are three kinds of OUTER JOIN: left outer join, right outer join and full outer join.SQL OUTER JOIN left outer join SQL left outer join is also known as SQL left join.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. The following illustrate SQL left outer syntax of joining 2 tables: tableA and tableB: 1 2 3 4 SELECT column1, column2... FROM tableA LEFT JOIN tableB ON joincondition WHERE rowcondition SQL OUTER JOIN left outer join example The following query selects all customers and their orders: 1 2 3 4 5 6 SELECT c. In case, there is no matching row in the orders table found for the row in the customers table, the orderid column in the orders table is populated with NULL values. We can use Venn diagram to visualize how SQL LEFT OUTER JOIN works. SQL OUTER JOIN right outer join SQL right outer join returns all rows in the right table and all the matching rows found in the left table. The syntax of the SQL right outer join is as follows: 1 2 3 4 SELECT column1, column2... ![]() SQL OUTER JOIN right outer join example The following example demonstrates the SQL right outer join: 1 2 3 4 5 6 SELECT c. The following Venn diagram illustrates how the SQL right outer join works: SQL OUTER JOIN full outer join The syntax of the SQL full outer join is as follows: 1 2 3 4 SELECT column1, column2... FROM tableA FULL OUTER JOIN tableB ON joincondition WHERE rowcondition SQL full outer join returns: all rows in the left table tableA. Some database management systems do not support SQL full outer join syntax e.g., MySQL. Because SQL full outer join returns a result set that is a combined result of both SQL left join and SQL right join. Therefore you can easily emulate the SQL full outer join using SQL left join and SQL right join with UNION operator as follows: 1 2 3 4 5 6 7 SELECT column1, column2... FROM tableA LEFT JOIN tableB ON joincondition UNION SELECT column1, column2... FROM tableA RIGHT JOIN tableB ON joincondition SQL OUTER JOIN full outer join example The following query demonstrates the SQL full outer join: 1 2 3 4 5 6 SELECT c. Was this tutorial helpful Yes No Previous Tutorial: SQL INNER JOIN Next Tutorial: SQL UNION SQL Basic SQL SELECT SQL DISTINCT SQL WHERE SQL ORDER BY SQL BETWEEN SQL IN SQL IS NULL SQL EXISTS SQL LIKE SQL Alias SQL INNER JOIN SQL OUTER JOIN SQL Self Join SQL GROUP BY SQL HAVING SQL Subquery SQL INSERT SQL UPDATE SQL DELETE SQL Aggregates SQL Aggregate Functions SQL AVG SQL COUNT SQL MIN SQL MAX SQL SUM SQL Constraints PRIMARY KEY FOREIGN KEY CHECK Constraint UNIQUE Constraint DEFAULT Constraint NOT NULL Constraint SQL Resources SQL Cheat Sheet SQL Sample Database Useful SQL Sites MySQL Tutorial PostgreSQL Tutorial SQLite Tutorial SQL Server Tutorial Oracle Tutorial PLSQL Tutorial Db2 Tutorial MariaDB Tutorial Return to top of page Copyright 2021 by ZenTut Website. All Rights Reserved.
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