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select * from v$version;
BANNER
Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

create table t42 (column1 numeric(30,20));

insert into t42 (column1) values (9999999999.10390625);
1 rows affected

insert into t42 (column1) values (0.10390625);
1 rows affected

select * from t42;
COLUMN1
9999999999.10390625
.10390625