pub trait ToSQL<'a, V: SQLParam> {
// Required method
fn to_sql(&self) -> SQL<'a, V>;
// Provided method
fn alias(&self, alias: &'static str) -> SQL<'a, V> { ... }
}pub trait ToSQL<'a, V: SQLParam> {
// Required method
fn to_sql(&self) -> SQL<'a, V>;
// Provided method
fn alias(&self, alias: &'static str) -> SQL<'a, V> { ... }
}