String data types (char, varchar, nchar, nvarchar) default to a size of 1 if no size is
specified in the declaration. For char and nchar this is confusing at best, but it is most probably a mistake for
varchar and nvarchar.
This rule raises an issue when no size is specified for varchar or nvarchar.
Noncompliant code example
DECLARE @myStr varchar; -- Noncompliant
Compliant solution
DECLARE @myStr varchar(255);
