Name the main types of JOIN operators in SQL language

Main types of JOIN operators in SQL:

• INNER JOIN — returns rows with matches in both tables.
• LEFT JOIN (LEFT OUTER JOIN) — returns all rows from the left table and matching rows from the right; if no match, the right side will be NULL.
• RIGHT JOIN (RIGHT OUTER JOIN) — the opposite, all rows from the right table and matching rows from the left.
• FULL JOIN (FULL OUTER JOIN) — returns all rows from both tables, with NULLs in place where there are no matches.
• CROSS JOIN — Cartesian product of two tables, each row of the first table is joined with every row of the second.

Example of INNER JOIN:

SELECT employees.name, departments.name
FROM employees
INNER JOIN departments ON employees.department_id = departments.id;