The bad examples of [G-2330](https://trivadis.github.io/plsql-and-sql-coding-guidelines/v4.2/4-language-usage/2-variables-and-types/3-character-data-types/g-2330/#example-bad) the following guidelines should use CHAR SEMANTIC: ```sql co_null_string constant varchar2(1 char) := ''; ``` instead of ```sql co_null_string constant varchar2(1) := ''; ```