Re: problemas float
Hola jose,
Como bien indica Faustino, un cambio de tipo de dato es lo recomendable en este caso.
La documentación indica:
"5. If you are comparing FLOAT or DOUBLE columns with numbers that have decimals, you can't use equality (=) comparisons. This problem is common in most computer languages because not all floating-point values can be stored with exact precision. In some cases, changing the FLOAT to a DOUBLE fixes this. See Sección A.5.8, “Problemas con comparaciones en Floating-Point”." -
http://dev.mysql.com/doc/refman/5.0/en/no-matching-rows.html
Ahora bien si deseas mantener tu columna como FLOAT puedes hacer un CONVERT. algo como:
select * from TARIFA_ENCORDADO where CONVERT(galga, DECIMAL) = 1.20;
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