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HavingAggregateFunction

drive::query::having

Enum HavingAggregateFunction 

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pub enum HavingAggregateFunction {
    Count,
    Sum,
    Avg,
}
Expand description

Aggregate function applied to a group on the left side of a HavingClause. These are the per-group aggregates whose result is the scalar / numeric value the right-side operand compares against.

MIN / MAX / TOP / BOTTOM deliberately don’t appear here — they’re cross-group ranking primitives that live on the right side via HavingRanking (e.g. HAVING COUNT(*) EQ MAX).

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Count

COUNT(*) when HavingAggregate::field is empty, otherwise COUNT(field).

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Sum

SUM(field). Numeric field required.

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Avg

AVG(field). Numeric field required; result is f64.

Trait Implementations§

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impl Clone for HavingAggregateFunction

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fn clone(&self) -> HavingAggregateFunction

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 HavingAggregateFunction

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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 HavingAggregateFunction

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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 HavingAggregateFunction

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fn eq(&self, other: &HavingAggregateFunction) -> 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 HavingAggregateFunction

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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 HavingAggregateFunction

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impl Eq for HavingAggregateFunction

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impl StructuralPartialEq for HavingAggregateFunction

Auto Trait Implementations§

Blanket 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
where T: ?Sized,

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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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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
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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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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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
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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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>
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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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

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fn from(t: T) -> T

Returns the argument unchanged.

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

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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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Mutably borrows self, then passes self.deref_mut() into the pipe function.
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const ALIGN: usize

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type Init = T

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type Output = T

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

Immutable access to a value. Read more
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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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