按日期分组、Distinct和忽略其他筛选器- Power BI

基础概念

在Power BI中，按日期分组、Distinct（去重）和忽略其他筛选器是数据处理和分析中的常见操作。

按日期分组：将数据根据日期进行分组，以便进行聚合操作，如求和、平均值等。
Distinct：去除数据中的重复项，确保每个值只出现一次。
忽略其他筛选器：在进行某些操作时，忽略其他已应用的筛选器，确保操作的准确性。

类型

按日期分组：可以按年、月、日等不同粒度进行分组。
Distinct：适用于任何数据类型，包括字符串、数字、日期等。
忽略其他筛选器：通常用于计算和数据转换操作。

应用场景

按日期分组：销售数据分析、用户行为分析、网站流量分析等。
Distinct：用户统计、产品去重、数据清洗等。
忽略其他筛选器：计算特定条件下的唯一值数量、生成不受其他筛选器影响的报告等。

遇到的问题及解决方法

问题1：按日期分组后，数据未按预期显示

原因：可能是日期格式不正确，或者分组粒度设置不当。

解决方法：

确保日期字段格式正确，通常是YYYY-MM-DD。
检查分组粒度设置，确保选择了合适的分组方式（如年、月、日）。

// 示例代码：按日期分组
let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwMlSK1YlWsgsVYrJzS3JyVYpWsgvqKwNz0lVKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSflg==", BinaryEncoding.Base64)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t])),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Date"}, {{"Count", each Table.RowCount(_), type number}})
in
    #"Grouped Rows"

问题2：Distinct操作未去除重复项

原因：可能是数据源中存在隐藏的重复项，或者Distinct操作未正确应用。

解决方法：

检查数据源，确保没有隐藏的重复项。
确保Distinct操作正确应用，可以使用Power Query编辑器进行操作。

// 示例代码：Distinct操作
let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwMlSK1YlWsgsVYrJzS3JyVYpWsgvqKwNz0lVKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgqKSwuT0gtKkpsSgq