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43 lines
874 B
Markdown
43 lines
874 B
Markdown
---
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toc_priority: 109
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---
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# topKWeighted {#topkweighted}
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类似于 `topK` 但需要一个整数类型的附加参数 - `weight`。 每个输入都被记入 `weight` 次频率计算。
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**语法**
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``` sql
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topKWeighted(N)(x, weight)
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```
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**参数**
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- `N` — 要返回的元素数。
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**参数**
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- `x` – (要计算频次的)值。
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- `weight` — 权重。 [UInt8](../../../sql-reference/data-types/int-uint.md)类型。
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**返回值**
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返回具有最大近似权重总和的值数组。
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**示例**
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查询:
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``` sql
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SELECT topKWeighted(10)(number, number) FROM numbers(1000)
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```
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结果:
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``` text
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┌─topKWeighted(10)(number, number)──────────┐
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│ [999,998,997,996,995,994,993,992,991,990] │
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└───────────────────────────────────────────┘
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```
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