How to disable Oracle table NUMBER column type auto round-up

Below is an example,
SQL> create table a
a_col1 NUMBER(8, 2)
SQL> update a set a_col1=1.999 where ...
I found column 'a_col1' of table 'a' value will be 2.00, but the application is for some financial calculation and doesn't allow any difference of the amount value (like, 1.999 <> 2.00), what I want to achieve is to disable the Oracle NUMBER type auto round-up and make above 'update' SQL fail with error, so I can trap the error and handle it in the program.
Could anyone advise me how to achieve above or any good suggestion ? Thanks.

user12317666 wrote:
Below is an example,
SQL> create table a
a_col1 NUMBER(8, 2)
SQL> update a set a_col1=1.999 where ...
I found column 'a_col1' of table 'a' value will be 2.00, but the application is for some financial calculation and doesn't allow any difference of the amount value (like, 1.999 <> 2.00), what I want to achieve is to disable the Oracle NUMBER type auto round-up and make above 'update' SQL fail with error, so I can trap the error and handle it in the program.
Could anyone advise me how to achieve above or any good suggestion ? Thanks.Oracle does not auto-round.
you have data presentation problem; not data storage problem.

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