avgWeighted

引入版本：v20.1.0 计算加权算术平均值。语法

avgWeighted(x, weight)

参数

返回值 如果所有权重都等于 0，或者提供的 weight 参数为空，则返回 NaN；否则返回加权平均值。Float64 示例 使用示例

Query

SELECT avgWeighted(x, w)
FROM VALUES('x Int8, w Int8', (4, 1), (1, 0), (10, 2))

Response

┌─avgWeighted(x, w)─┐
│                 8 │
└───────────────────┘

混合整数和浮点数权重

Query

SELECT avgWeighted(x, w)
FROM VALUES('x Int8, w Float64', (4, 1), (1, 0), (10, 2))

Response

┌─avgWeighted(x, w)─┐
│                 8 │
└───────────────────┘

当所有权重都为零时，返回 NaN

Query

SELECT avgWeighted(x, w)
FROM VALUES('x Int8, w Int8', (0, 0), (1, 0), (10, 0))

Response

┌─avgWeighted(x, w)─┐
│               nan │
└───────────────────┘

空表会返回 NaN

Query

CREATE TABLE test (t UInt8) ENGINE = Memory;
SELECT avgWeighted(t, t) FROM test

Response

┌─avgWeighted(t, t)─┐
│               nan │
└───────────────────┘

​avgWeighted