what is an outer join in sql
What is SQL OUTER JOIN? The SQL OUTER JOIN clause is a variation of the SQL JOIN clause enables a SELECT statement to access more than one table. The JOIN clause controls how tables are linked. It is a qualifier of the SQL FROM clause. The OUTER JOIN clause differs from the standard JOIN clause (also known as the INNER JOIN clause) in that rows are returned even when there are no matches through the JOIN critieria on the second table.