C Data Type
The c data type accepts only printing characters. Non-printing characters, such as control characters, are converted into blanks.
The DBMS ignores blanks when comparing c strings. For example, the c string:
"the house is around the corner"
is treated identically to:
"thehouseisaroundthecorner"
The c type is supported for backward compatibility, but char is the recommended fixed-length character data type.