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This article will provide a full overview, with examples of the SQL Outer join, including the full, right and left outer join as well as cover the union between SQL left and right outer joins.
The FULL OUTER JOIN keyword returns all records when there is a match in left (table1) or right (table2) table records. Tip: FULL OUTER JOIN and FULL JOIN are the same. FULL OUTER JOIN Syntax
SQL Outer Join. In a relational DBMS, we follow the principles of normalization that allows us to minimize the large tables into small tables. By using a select statement in Joins, we can retrieve the big table back. Outer joins are of following three types.
How to do an Outer Join in SQL. To do an outer join on our sample data, we could use the following query: SELECT students.name, books.title FROM students FULL OUTER JOIN books ON students.student_id=books.student_id; In this example, we are selecting the names from the students table and the book titles from the books table.
This article explains the usage of outer JOINs in SQL (including FULL, LEFT, and RIGHT JOINs) with some practical examples.
In this tutorial, you will learn how to use SQL FULL OUTER JOIN clause to query data from multiple tables.
For example, it is not present in MySQL, but it can be easily emulated: SELECT * FROM left_table. LEFT JOIN right_table. ON right_table.key = left_table.key UNION ALL SELECT * FROM left_table. RIGHT JOIN right_table. ON right_table.key = left_table.key WHERE left_table.key IS NULL. Basic queries for different types of table joins: