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HavingRankingKind

drive::query::having

Enum HavingRankingKind 

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pub enum HavingRankingKind {
    Min,
    Max,
    Top,
    Bottom,
}
Expand description

Cross-group ranking primitive on the right side of a HavingClause. The ranking is computed over the set of group results (one per row produced by GROUP BY), not over the raw rows — so HAVING COUNT(*) EQ MAX selects groups whose count equals the maximum count across all groups.

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Min

Smallest group-aggregate value across the result set (single scalar).

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Max

Largest group-aggregate value across the result set (single scalar).

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Top

Set of the N largest group-aggregate values. Pair with IN for membership (COUNT(*) IN TOP(5)); single-value operators (EQ, >, <, …) treat TOP(1) as the maximum.

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Bottom

Set of the N smallest group-aggregate values. Symmetric counterpart to Self::Top.

Trait Implementations§

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impl Clone for HavingRankingKind

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fn clone(&self) -> HavingRankingKind

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for HavingRankingKind

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

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for HavingRankingKind

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for HavingRankingKind

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

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

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

Serialize this value into the given Serde serializer. Read more
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impl Copy for HavingRankingKind

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impl Eq for HavingRankingKind

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impl StructuralPartialEq for HavingRankingKind

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> Conv for T

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where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> CostsExt for T

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fn wrap_with_cost(self, cost: OperationCost) -> CostContext<Self>
where Self: Sized,

Wraps any value into a CostContext object with provided costs.
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fn wrap_fn_cost( self, f: impl FnOnce(&Self) -> OperationCost, ) -> CostContext<Self>
where Self: Sized,

Wraps any value into CostContext object with costs computed using the value getting wrapped.
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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where &'a Self: for<'a> IntoIterator,

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fn from(t: T) -> T

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

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const ALIGN: usize

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fn tap(self, func: impl FnOnce(&Self)) -> Self

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Mutable access to a value. Read more
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where Self: Borrow<B>, B: ?Sized,

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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

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