A bind reference replaces a single value or expression.To create a bind reference in a query, prefix the parameter name with a colon (:).
where field_name = :p_b_field_name;
A lexical reference is a text string and can replace any part of a SELECT statement, such as column names, the FROM clause, the WHERE clause, or the ORDER BY clause. To create a lexical reference in a query, prefix the parameter name with an ampersand (&).
order by &p_l_field_name ;
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