Don't laugh, please! I realize that I was wrong for several years!

Hello
I just find out that the type of data NUMBER (p, s) is not what I thought it was. Until now, I thought that this column type:
NUMBER(2,1)
can contain values such as
9.9,  10.1,  99.9,  etc.
but it is not true: P column with this data type can only contain values such as
0.9,  1.5,  9.9,  etc
According to this, the data type NUMBER (p, s) where p < in not useful at all, but Oracle allows you to create such a column. Anyone know why?

Thank you! :)

It is useful, it allows to specify a certain range of valid numbers.
For example:

SQL>create table t(t1  number(1,2));

Table created.

SQL>insert into t values (1);
insert into t values (1)
                      *
ERROR at line 1:
ORA-01438: value larger than specified precision allows for this column

SQL>insert into t values (0.1);
insert into t values (0.1)
                      *
ERROR at line 1:
ORA-01438: value larger than specified precision allows for this column

SQL>insert into t values (0.01);

1 row created.

SQL>insert into t values (0.001); -- will be rounded to 0.00

1 row created.

SQL>select * from t;

        T1
----------
       .01
         0

In this example, the only valid values are {0, 0.01, 0.02.. 0.09}.

Tags: Database

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