Left Outer Join in SQL Example | SQL Left Join Keyword

Left Outer Join in SQL Example | SQL Left Join Keyword

Left Outer Join in SQL returns all records from the left table, and the matched records from the right table. SQL Left Join Keyword Example.

SQL Left Outer Join returns all records from the left table (table1) and the matched records from the right table (table2). SQL LEFT JOIN clause allows us to query data from the multiple tables. It returns all the rows from a left table and the matching rows from the right table. This means that the left join returns all the values from a left table, plus matched values from a right table or NULL in the case of no matching join predicate.

In some SQL databased LEFT OUTER JOIN is also called as LEFT JOIN.

Left Outer Join in SQL

The syntax of SQL Left Join is the following.

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

In this syntax, table1 and table2 are the left and right tables, respectively.

For each row from the table1 table, the query compares it with all the rows from the table2 table. If the pair of rows causes the join predicate to evaluate to true, the column values from these rows will be in the combined form to the new row, which then included in the final result set.

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