Struct WindowFnExpr 

pub struct WindowFnExpr<'a, V: SQLParam, T: DataType, N: Nullability, S = ()> { /* private fields */ }

A window function that still needs its OVER (...) clause.

row_number, rank, lag and the other pure window functions return this type. It implements neither Expr nor ToSQL, so it cannot be used in a query until over is called.

// ROW_NUMBER() without OVER is not an expression.
let wrong = gt(row_number::<Value>(), 1);

Implementations

impl<'a, V, T, N, S> WindowFnExpr<'a, V, T, N, S>

where V: SQLParam + 'a, T: DataType, N: Nullability,

pub fn over<W>( self, spec: WindowSpec<'a, V, W>, ) -> SQLExpr<'a, V, T, N, Scalar, (S, W)>

Adds the window clause, producing a scalar expression (fn OVER (...)).

Trait Implementations

impl<'a, V: Clone + SQLParam, T: Clone + DataType, N: Clone + Nullability, S: Clone> Clone for WindowFnExpr<'a, V, T, N, S>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, V: Debug + SQLParam, T: Debug + DataType, N: Debug + Nullability, S: Debug> Debug for WindowFnExpr<'a, V, T, N, S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.