sorry to bother you with a simple question, (I'm a new user of postgresql), how do I change the data type of a column of text, to numeric or integer?
I tried with:
ALTER TABLE table_name ALTER COLUMN col_name TYPE integer ;
It gives me a mistake ERROR: la columna no puede convertirse automáticamente al tipo integer SUGERENCIA: Especifique una expresión USING para llevar a cabo la conversión.
translation: the column can't be converted automatically to type integer .... specify an expression using USING to make the conversion.
I also tried on pgadmin3, but couldn't found how to do it...