What is Full Join in SQL?
Full Join is a keyword, which is used to select all records from the right table and also from the left table.
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Full Join in SQL
The Full Join basically returns all records from the left table and also from the right table. For example, let’s say, we have two tables, Table A and Table B. When Full Join is applied on these two tables, it returns us all records from both Table A and Table B. If the condition is not met, then null value is displayed instead.
SELECT columns FROM table1 name FULL JOIN table2 name ON table1.coumn_x = table2.column_y;
where SELECT, FULL JOIN, and ON are the keywords, columns is the list of columns, table1 is the first table and table2 is the second table, and column_x and column_y are the columns for performing Left Join, followed by a semicolon.
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Let’s apply Full Join to two tables, the employee table and the department table
Select employee.e_name, employee.e_dept, department.d_name, department.d_location from employee FULL JOIN department ON employee.e_dept = department.d_name;
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After writing the query, click on the execute button to check for errors. Once the query is executed, a message appears like ‘Commands completed successfully’.
This brings us to the end of this tutorial sections on JOIN operators.