power bi dax引用参数
    英文回答：
    Power BI DAX (Data Analysis Expressions) allows us to create calculations and formulas to manipulate data in Power BI. One of the powerful features of DAX is the ability to reference parameters. Parameters are user-defined values that can be used in calculations and filters to make the reports more dynamic and interactive.
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    To reference a parameter in DAX, we first need to define the parameter. This can be done by creating a new parameter in Power BI Desktop or by defining a parameter table in Power BI Service. Once the parameter is defined, we can use it in our DAX formulas by referencing its name.
    For example, let's say we have a parameter named "Year" that allows the user to select a specific year. We can use this parameter in a DAX formula to calculate the total sales for the selected year. The formula would look something like this:
    Total Sales = CALCULATE(SUM(Sales[Amount]), Sales[Year] = Year)。
    In this formula, "Sales" is the name of the table that contains the sales data, "Amount" is the name of the column that contains the sales amount, and "Year" is the name of the parameter. The CALCULATE function is used to apply a filter to the sales data based on the selected year.
    By referencing the "Year" parameter in our DAX formula, the total sales will automatically update whenever the user selects a different year. This allows us to create dynamic reports that respond to user input.
    中文回答：
    Power BI DAX（数据分析表达式）允许我们在Power BI中创建计算和公式来操作数据。DAX的一个强大功能是可以引用参数。参数是用户定义的值，可以在计算和过滤器中使用，使报表更具动态性和互动性。
    要在DAX中引用参数，我们首先需要定义参数。这可以通过在Power BI Desktop中创建新
参数或在Power BI Service中定义参数表来完成。一旦参数被定义，我们可以通过引用其名称在DAX公式中使用它。
    例如，假设我们有一个名为“Year”的参数，允许用户选择特定的年份。我们可以在DAX公式中使用该参数来计算所选年份的总销售额。公式可能如下所示：
    总销售额 = CALCULATE(SUM(销售[金额]), 销售[年份] = Year)。
    在这个公式中，“销售”是包含销售数据的表的名称，“金额”是包含销售金额的列的名称，“Year”是参数的名称。CALCULATE函数用于根据所选年份对销售数据应用过滤器。
    通过在DAX公式中引用“Year”参数，总销售额将在用户选择不同年份时自动更新。这使我们能够创建对用户输入做出响应的动态报表。