What is the difference between INNER JOIN, LEFT JOIN, and RIGHT JOIN?

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INNER JOIN, LEFT JOIN, and RIGHT JOIN are SQL operations used to combine data from two or more tables based on a related column.

INNER JOIN returns only the rows that have matching values in both tables. If a row in one table does not have a corresponding match in the other table, it is excluded from the result. This is useful when you want only the records that exist in both tables.

LEFT JOIN (or LEFT OUTER JOIN) returns all rows from the left table and the matching rows from the right table. If there is no match in the right table, the result will still include the left table’s row with NULL values for the columns from the right table. This is helpful when you want to preserve all data from the left table, even if there’s no corresponding data in the right table.

RIGHT JOIN (or RIGHT OUTER JOIN) is the opposite of LEFT JOIN. It returns all rows from the right table and the matching rows from the left table. If a row in the right table has no corresponding match in the left table, it still appears in the result, with NULLs for the left table’s columns.

Summary:

• INNER JOIN: Only matching rows from both tables.

• LEFT JOIN: All rows from the left table + matched rows from the right table (NULL if no match).

• RIGHT JOIN: All rows from the right table + matched rows from the left table (NULL if no match).

These joins help in combining relational data efficiently, depending on whether you want only matches or to retain all records from one of the tables.

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