How do you Trim a CHAR field

Question

Hello,
I have a field 'A' that is CHAR(8)
How do I trim this field to compare with other records that are Varchar2() fields?
Will the Trim function work? like trim(A). I know you can trim a Varchar2 field.

Answer 1

SQL> create table t (c char(10), v varchar2(10));
Table created.
SQL> insert into t values ('test','test');
1 row created.
SQL> select length(c), length(v), length(trim(c)), length(trim(v)) from t;
LENGTH(C)  LENGTH(V) LENGTH(TRIM(C)) LENGTH(TRIM(V))
        10          4               4               4
SQL> select * from t where c = v;
no rows selected
SQL> select * from t where trim(c) = v;
C          V
test       test
SQL>