Teniendo la query
Código PHP:
SELECT t1.*, t2.* FROM tabla1 AS t1
JOIN tabla2 AS t2 ON (t1.id=t2.id)
WHERE t2.zipcode IN(123,234,456,789,159 );
Código PHP:
SELECT t1.*, t2.* FROM tabla1 AS t1
JOIN tabla2 AS t2 ON (t1.id=t2.id AND t2.zipcode IN(123,234,456,789,159 ));
la 1º query trae 100000 registros, mientras que la 2º solo 1500 registros.
porque?