MySQL join not behaving as expected - mysql

Question

I have created a MySQL view to grab data from four differents tables :
CREATE VIEW `documents_scannes_view` AS
select `ds`.`id_document` AS `id_document`,
`ba`.`num_boite` AS `num_boite`,
`ds`.`annee` AS `annee`,
`ds`.`ref_document` AS `ref_document`,
`ds`.`num_client` AS `num_client`,
`cl`.`nom_client` AS `nom_client`,
`ds`.`nbre_a4` AS `nbre_a4`,
`ds`.`nbre_a3` AS `nbre_a3`,
`ds`.`nbre_autres` AS `nbre_autres`,
((`ds`.`nbre_autres` + `ds`.`nbre_a3`) + `ds`.`nbre_a4`) AS `nbre_total`,
`ds`.`date_scan` AS `date_scan`,`ds`.`qualite` AS `qualite`,
`ds`.`id_operateur` AS `id_operateur`,
`ut`.`nom_complet` AS `nom_complet`,
`ds`.`observations` AS `observations`,
`ds`.`chemin` AS `chemin`
from (((`boite_archive` `ba` left join `documents_scannes` `ds` on((`ds`.`num_boite` = `ba`.`num_boite`)))
left join `clients` `cl` on((`ds`.`num_client` = `cl`.`num_client`)))
left join `utilisateurs` `ut` on((`ds`.`id_operateur` = `ut`.`id_user`)))
The tables are respectively :
documents_scannes : List of scanned documents
boite_archive : List of box that contains the scanned documents
clients : List of customer that issued the scanned documents
utilisateurs : List of personal that are scanning the documents
The joins is performed on the primary keys of the tables.
My objective is to get the list of the scanned documents (documents_scannes) from each box (boite_archive) fetching in the same time the name of the client (from clients table) and the name of the operator who has done the scan (from table utilisateurs).
My problem is when I :
SELECT * FROM documents_scannes_view WHERE num_boite = '1131';
The box number 1131 is empty it contains no scanned documents but I get one row :
Who can help me point the source of my error and how I can correct it ?
Thanks in advance.
I am not sure about the joins in the bottom of the query. It's the source of the issue. How I can fix it to get no results when the box is emprt ?

Answer 1

If you don't want select an empty row where the join columns don't match change to an inner join instead of left join
from (((`boite_archive` `ba` inner join `documents_scannes` `ds` on((`ds`.`num_boite` = `ba`.`num_boite`)))
left join `clients` `cl` on((`ds`.`num_client` = `cl`.`num_client`)))
left join `utilisateurs` `ut` on((`ds`.`id_operateur` = `ut`.`id_user`)))
The LEFT JOIN keyword returns all rows from the left table (table1), with the matching rows in the right table (table2). The result is NULL in the right side when there is no match.
Image ref.