Struct DistinctOn 

pub struct DistinctOn {
    pub columns: Vec<String>,
}

DISTINCT ON clause (PostgreSQL specific).

Fields

columns: Vec<String>

Columns to distinct on.

Implementations

impl DistinctOn

pub fn new<I, S>(columns: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

Create a new DISTINCT ON clause.

pub fn to_postgres_sql(&self) -> String

Generate PostgreSQL DISTINCT ON clause.

pub fn to_mysql_workaround(&self) -> String

Generate MySQL workaround using GROUP BY. Note: This is not exactly equivalent to DISTINCT ON.

Trait Implementations

impl Clone for DistinctOn

fn clone(&self) -> DistinctOn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DistinctOn

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DistinctOn

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for DistinctOn

fn eq(&self, other: &DistinctOn) -> 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 Serialize for DistinctOn

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for DistinctOn

impl StructuralPartialEq for DistinctOn