A question in sqlite_create_function

I was translating and don´t understand this: line 90 <para> This example will call the <function>md5</function> on each <literal>filename</literal> column in the database and return the result into <parameter>$rows</parameter> </para> This "database" is not "table"? If I have a database with two tables, in example two columns named filename, one in each table. It will affect both or only the table i query? line 69 <parameter>$rows</parameter> This is not wrong? <parameter> is not only for functions parameters? Thanks! Fernando Correa da Conceição