Validating your Data Entry for Trailing Blanks

Today, I would like to experiment the use of CHECK constraint to validate the trailing blanks in the data.
Example,

demo$Vino%orcl> create table t(name varchar2(20)
2 check (length(name)-length(trim(name))=0));


Table created.


demo$Vino%orcl> insert into t values('Tom');
1 row created.


demo$Vino%orcl> insert into t values('Tom Peter');
1 row created.


demo$Vino%orcl> -- Name with trailing blanks


demo$Vino%orcl> insert into t values('Tom ');
insert into t values('Tom ')
*
ERROR at line 1:
ORA-02290: check constraint (DEMO.SYS_C005409) violated


demo$Vino%orcl> select * from t;


NAME
----------
Tom
Tom Peter

Hope this will be useful for you :-)