[EMAIL PROTECTED] wrote: > > Dear all, > > I am using > copy tableA from '/tmp/A.data' and have the following error: > > Unable to identify an operatior '=' for types 'varchar' > You will have to retype this query using an explicit cast. > > What is "an explicit cast"? Something like this: SELECT '0.80'::float; The '::float' tell Postgresql to cast '0.80' (a string) in to a real number (float). But you can't use an explicit cast in your query. I think the problem comes out of your table definition. > > Best regards, > Boris -- Guillaume Perréal - Stagiaire MIAG Cemagref (URH), Lyon, France Tél: (+33) 4.72.20.87.64