replace "Oracle 12c" with "Oracle Database 12c"

Author: PhilippSalvisberg

docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md

@@ -12,7 +12,7 @@ Oracle Database 12c
 
 ## Reason
 
-Default values have been nullifiable until Oracle 12c. Meaning any tool sending null as a value for a column having a default value bypassed the default value. Starting with Oracle 12c default definitions may have an `on null` definition in addition, which will assign the default value in case of a `null` value too.
+Default values have been nullifiable until Oracle Database 12c. Meaning any tool sending null as a value for a column having a default value bypassed the default value. Starting with Oracle Database 12c default definitions may have an `on null` definition in addition, which will assign the default value in case of a `null` value too.
 
 ## Example (bad)