Struct ExprExists 

pub struct ExprExists {
    pub subquery: Box<Query>,
}

Tests whether a subquery returns any rows.

Returns true if the subquery produces at least one row.

Examples

exists(subquery)      // returns `true` if subquery has results
not_exists(subquery)  // returns `true` if subquery has no results

Fields

subquery: Box<Query>

The subquery to check.

Trait Implementations

impl Clone for ExprExists

fn clone(&self) -> ExprExists

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExprExists

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

Formats the value using the given formatter.

impl From<ExprExists> for Expr

fn from(value: ExprExists) -> Expr

Converts to this type from the input type.

impl PartialEq for ExprExists

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ExprExists