Struct At 

pub struct At<Scope, S>(/* private fields */);

Sources S read by a clause written against Scope.

They resolve against Scope first and then against the enclosing scope. This is how a subquery’s clauses can read the outer query’s tables.

Never NULL by itself: a subquery’s inner sources do not make the outer expression NULL (the subquery operator decides that).

Trait Implementations

impl<Scope, S> Clone for At<Scope, S>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Scope, S> Copy for At<Scope, S>

impl<Scope, S> Debug for At<Scope, S>

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

Formats the value using the given formatter.

impl<Scope, S> Default for At<Scope, S>

fn default() -> Self

Returns the “default value” for a type.

impl<Outer, Scope, S, Proof> SourcesIn<Outer, Proof> for At<Scope, S>

where Scope: Concat<Outer>, S: SourcesIn<<Scope as Concat<Outer>>::Output, Proof>,

type Nullable = NonNull

Null when an outer join can make the expression NULL even though its declared nullability says otherwise.