Description: The ‘USING’ clause in SQL is a tool used to specify the columns that will be employed in a JOIN operation between two or more tables. This clause simplifies the syntax of queries by eliminating the need to use the ‘ON’ clause to define the join conditions. When the tables involved in the JOIN have columns with the same name, ‘USING’ allows the developer to directly indicate which of these columns will be used for comparison. This not only makes the query more readable but also reduces the possibility of errors when writing join conditions. The ‘USING’ clause is especially useful in situations where complex relational databases are involved, where joins are common and tables may have multiple columns with identical names. In summary, ‘USING’ is an efficient and clear way to handle joins in SQL, enhancing the readability and maintainability of SQL code.
