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Developer-C 11.1
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CREATE TABLE dbClientes (`id` int, `Nombre` varchar(6)) ;
INSERT INTO dbClientes (`id`, `Nombre`) VALUES (1, 'Juan'), (2, 'Victor'), (3, 'Arturo') ;
CREATE TABLE syUsers (`id` int, `Nombre` varchar(12)) ;
INSERT INTO syUsers (`id`, `Nombre`) VALUES (1, 'Contabilidad'), (2, 'JuankGlezz') ;
CREATE TABLE syUsers_WebAccess (`id` int, `idUser` int, `idCliente` int) ;
INSERT INTO syUsers_WebAccess (`id`, `idUser`, `idCliente`) VALUES (1, 1, 1), (2, 1, 3), (3, 2, 1) ;
SELECT DISTINCT C.Nombre, C.id, IFNULL(NC.NumCuentas,0) AS NumCuentas FROM dbClientes C LEFT JOIN ( SELECT idCliente, count(id) AS NumCuentas FROM syUsers_WebAccess GROUP BY idCliente) NC ON NC.idCliente = C.id WHERE NOT EXISTS(SELECT 1 FROM syUsers_WebAccess WHERE idUser = 2 AND idCliente = NC.idCliente) ;
Nombre
id
NumCuentas
Victor
2
0
Arturo
3
1