Enum SubqueryKind 

pub enum SubqueryKind {
    Exists,
    Scalar,
    In,
}

What a nested query used as a value does with its rows.

Variants

Exists

EXISTS (...): true when the block produced a row.

Scalar

(SELECT ...) in a value position: the first row’s first column, or NULL when it produced nothing.

In

The right side of an IN.

Trait Implementations

impl Clone for SubqueryKind

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SubqueryKind

impl Debug for SubqueryKind

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

Formats the value using the given formatter.

impl Eq for SubqueryKind

impl PartialEq for SubqueryKind

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SubqueryKind