I had to change the datatype of a column from text to integer. The column contained integers (obviously stored as text). When I tried to change the datatype of the column I got an error message saying that the column can not be cast to integer: Operation : ALTER TABLE "public"."subjectgroupcondition" ALTER COLUMN "param1" TYPE INTEGER Result : "ERROR: column "param1" cannot be cast to type "pg_catalog.int4"" However when I created an other integer column in the table and updated it from the text column there was no problem casting the data: Operation : UPDATE public.subjectgroupcondition SET param2 = cast(param1 as integer); Result : "OK." Since pg knows that it should cast the data and it can cast it I think I should have been able to change the datatype in the first instance. Maybe this behaviour has a good reason but I don't know what it is. Regards, SWK
