NATURAL JOIN Oracle

  • Natural joins in SQL automatically link tables based on columns with the same name.
  • These joins simplify queries by eliminating the need to list matching columns explicitly.
  • The syntax for a natural join is straightforward:
  • SQL automatically identifies common column names between tables and performs the join.

NATURAL JOINS HAVE PROS AND CONS

Pros

  • Conciseness: Natural joins reduce the amount of code, making queries more concise and readable.
  • Maintenance: If the schema changes and column names are adjusted, queries don’t require manual updates.

 

Cons

  • Ambiguity: In cases where multiple columns share the same name, natural joins may lead to ambiguity.
  • cannot be used on other database products
  • Limited Control: Natural joins may not be suitable for complex queries that demand precise control over matching columns.

In this example below, wre are going to use natural join to combine two tables:

Example,

SELECT *
FROM employees
NATURAL JOIN departments;

Things to keep in mind when using Natural Joins:

  • Use for Simplicity: Employ natural joins for simple queries where column names are consistent.
  • Be Mindful of Ambiguity: Avoid natural joins when dealing with tables containing multiple columns with identical names.

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