A SQL JOIN clause is a way to combine rows from two or more tables, based on a common column between them. The great thing about relational databases is that they are just that––relational.Relational ...

A complex join in SQL is also referred to as an outer join. It is not necessarily more complex than an inner join. It is referred to as "complex" simply because SQL is conducting an inner join in ...

Learn how to use SQL joins to check and fix data integrity and consistency issues across tables. See SQL join examples for finding missing values, duplicates, mismatches, and outliers.