Function floor 

pub fn floor<'a, V, E>(
    expr: E,
) -> SQLExpr<'a, V, <E::SQLType as RoundingPolicy<V::DialectMarker>>::Output, E::Nullable, E::Aggregate>
where
    V: SQLParam + 'a,
    E: Expr<'a, V>,
    E::SQLType: RoundingPolicy<V::DialectMarker>,

FLOOR - rounds a number down to the nearest integer.

Returns a dialect-aware float type, preserves nullability.

Example

use drizzle_core::expr::floor;

// SELECT FLOOR(users.price)
let floored = floor(users.price);