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MySQL - JOIN query cases with examples

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Created by:
Waleed-Gates
352

In this short article, we would like to show how to built MySQL JOIN queries for different cases.

Possible JOIN cases in MySQL.
Possible JOIN cases in MySQL.
VisualisationSQL Query

INNER JOIN in MySQL

INNER JOIN

SELECT *
FROM table_a A
JOIN table_b B ON A.key = B.key

LEFT OUTER JOIN in MySQL

LEFT OUTER JOIN

SELECT *
FROM table_a A
LEFT JOIN table_b B ON A.key = B.key

RIGHT OUTER JOIN in MySQL

RIGHT OUTER JOIN

SELECT *       
FROM table_a A
RIGHT JOIN table_b B ON A.key = B.key

FULL OUTER JOIN in MySQL

FULL OUTER JOIN

SELECT * FROM table_a A
LEFT JOIN table_b B ON A.key = B.key
UNION
SELECT * FROM table_a A
RIGHT JOIN table_b B ON A.key = B.key

LEFT OUTER JOIN with exclusion in MySQL

LEFT OUTER JOIN with exclusion

SELECT  *
FROM table_a A
LEFT JOIN table_b B ON A.key = B.key
WHERE B.key IS NULL

RIGHT OUTER JOIN with exclusion in MySQL

RIGHT OUTER JOIN with exclusion

SELECT *
FROM table_a A
RIGHT JOIN table_b B ON A.key = B.key
WHERE A.key IS NULL

FULL OUTER JOIN with exclusion in MySQL

FULL OUTER JOIN with exclusion

SELECT * FROM table_a A
LEFT JOIN table_b B ON A.key = B.key
WHERE B.key IS NULL 
UNION
SELECT * FROM table_a A
RIGHT JOIN table_b B ON A.key = B.key
WHERE A.key IS NULL

Alternative titles

  1. MySQL - difference between inner / outer joins
  2. MySQL - inner / outer joins explanation
  3. MySQL - INNER JOIN
  4. MySQL - LEFT OUTER JOIN
  5. MySQL - RIGHT OUTER JOIN
  6. MySQL - FULL OUTER JOIN
  7. MySQL - LEFT OUTER JOIN with exclusion
  8. MySQL - RIGHT OUTER JOIN with exclusion
  9. MySQL - RIGHT OUTER JOIN with exclusion
  10. MySQL - JOIN list + SQL Query
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