Re: Casting json (or jsonb) to real

Wells Oliver <wells.oliver@gmail.com> writes:
> Well, it's because the representation of the value is getting double
> quoted, so it's
> select '"1.453"'::real, which yields ERROR:  cannot cast jsonb string to
> type real.

Oh ... that perhaps wasn't a great choice.  But it looks like you could
pretend the jsonb is a 1-element array, and do

regression=# select ('"1.4531"'::jsonb->>0)::real;
 float4
--------
 1.4531
(1 row)

                        regards, tom lane