I have a table with the following schema: CREATE TABLE foo (bar VARCHAR(32));
Every bar value has a format like a float, e.g. "2.5". Now I want that value multiplied by two and saved again as varchar. I was hoping to do smth like:
UPDATE foo SET bar = TO_VARCHAR( TO_FLOAT(bar) * 2); -- INCORRECT!!!!
Try UPDATE foo SET bar = (bar::numeric * 2);
How is that done?
I know that the bar attribute ought to have type FLOAT, but I have to work with this legacy database. And anyway this table will rarely be updated.