CLOB types can only be converted to or from CHAR or VARCHAR types. For example, implicit conversion is performed on CLOB data that is inserted into a CHAR or VARCHAR column. See Implicit Type Conversions.
Comparisons of strings, fixed- or variable-length, require operands of equal length. The following table shows that the shorter string is converted by being padded on the right.
| Expression | Conversion | Result |
|---|---|---|
| 'x'='x ' | 'xΔ '='x ' | TRUE |
| 'x'='xx' | 'xΔ '='xx' | FALSE |
where Δ is a pad character.
If a character is not in the repertoire of the target character set, an error is reported.