ऐसा करने का एक तरीका:
show extra_float_digits ;
extra_float_digits
--------------------
3
create table float_numeric(number_fld float8);
insert into float_numeric values (21.291400909423828), (23.291400909422436);
select * from float_numeric ;
number_fld
--------------------
21.291400909423828
23.291400909422435
alter table float_numeric alter COLUMN number_fld type numeric using number_fld::text::numeric;
\d float_numeric
Table "public.float_numeric"
Column | Type | Collation | Nullable | Default
------------+---------+-----------+----------+---------
number_fld | numeric | | |
select * from float_numeric ;
number_fld
--------------------
21.291400909423828
23.291400909422435