com.holonplatform.core.query

## Interface QueryFunction.Count

- All Superinterfaces:
    Expression, QueryFunction<Long>
  Enclosing interface:
    QueryFunction<T>

      public static interface QueryFunction.Count
      extends QueryFunction<Long>

  A function which represents the count of a query result values.

  The result type is always a `Long`.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface com.holonplatform.core.query.QueryFunction

      `QueryFunction.Avg, QueryFunction.Count, QueryFunction.Max<T>, QueryFunction.Min<T>, QueryFunction.Sum<T>`

    - ### Nested classes/interfaces inherited from interface com.holonplatform.core.Expression

      `Expression.ExpressionResolverFunction<E extends Expression,R extends Expression>, Expression.InvalidExpressionException`

  - ### Method Summary

    All Methods Static Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `static QueryFunction.Count` | `create()` Create a new `QueryFunction.Count` function instance.

    - ### Methods inherited from interface com.holonplatform.core.query.QueryFunction

      `getResultType`

    - ### Methods inherited from interface com.holonplatform.core.Expression

      `validate`

- - ### Method Detail

    - #### create

          static QueryFunction.Count create()

      Create a new `QueryFunction.Count` function instance.
      Returns:
        New `QueryFunction.Count` function instance

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