Struct WindowFnExpr 

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

A window function expression that is not yet valid SQL.

Pure window functions like ROW_NUMBER, RANK, LAG, etc. MUST have an .over() call before they can be used in a query. This type enforces that at compile time by not implementing Expr or ToSQL.

Implementations

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

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

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

Apply a window specification, producing a usable scalar expression.

Generates <fn> OVER (...).

Trait Implementations

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

fn clone(&self) -> WindowFnExpr<'a, V, T, N>

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> Debug for WindowFnExpr<'a, V, T, N>

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

Formats the value using the given formatter.