Question

My query is like this….

SELECT tb1.name, COUNT(tb2.payment_date) as first_payment FROM table1 LEFT JOIN table2 tb2 ON tb2.id_user = tb1.id

+-----------+-------------+
| Name      |  Count      |
+-----------+-------------+
| John      |   543534543 |

but I wish that my query returns a limit on join, something like:

LEFT JOIN tb2 ON tb2.id_user = tb1.id { LIMIT JOIN }

return only one relationship…..

+-----------+-------------+
| Name      |  Count      |
+-----------+-------------+
| John      |   3         |

Answer 1

SELECT 
    tb1.name, 
    COUNT(tb2.payment_date) as first_payment 
FROM table1 
LEFT JOIN (SELECT id_user , MIN(id) FROM table2 GROUP BY id_user)as tb2 ON tb2.id_user = tb1.id