| character set translation : Interactive SQL | Behavior changes |
| character sets : translation | Character set translation |
| CHAR_LENGTH function : new features | New SQL features |
| CHAR_OEM_TRANSLATION option : behavior change 6.0.1 | Behavior changes |
| client/server communications : new features | New communications features |
| command-line : behavior change for -x | Behavior changes |
| Comments : % character | Other changes |
| comments : behavior changes | Other changes |
| CommLinks connection parameter : behavior change 6.0.1 | Behavior changes |
| compatibility library : installation | Using the compatibility library |
| compatibility library : introduction | Major upgrading issues |
| compatibility library : upgrades | Using the compatibility library |
| COMPUTE keyword | New SQL features |
| computed columns : new feature | New SQL features |
| connections : limit | Other new features |
| connections : pooling | New SQL features |
| conventions : documentation | Documentation conventions |
| cursors : behavior changes | Database server changes |