PowerBI

日期格式转换表：

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自定义格式转换：

=FORMAT(SUM(Table[Field]),"0.00%") 

 

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基础函数之转换函数：

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实践 #1：

表：表有字段From_Date，Week_Code (1-7)

需求：添加切片器WEEKDAY显示值Monday，Sunday，Monday，Tuesday，Wednesday，Thursday，Friday，Saturday。
　　选择Monday时，显示每月最后一个礼拜一的数据。

实现方式一：

 1，SQL只提取每月最后一周的数据
  2，添加计算列 weekday1，表达式如下：

Weekday1 = IF('Bonus'[WEEK_CODE]="7","Sunday",
IF('Bonus'[WEEK_CODE]="6","Saturday",
IF('Bonus'[WEEK_CODE]="5","Friday",
IF('Bonus'[WEEK_CODE]="4","Thursday",
IF('Bonus'[WEEK_CODE]="3","Wednesday",
IF('Bonus'[WEEK_CODE]="2","Tuesday",
IF('Bonus'[WEEK_CODE]="1","Monday",
"Blank"
)))))))

　3， 将weekday1 设置为切片器后，排序乱了

　　解决：选择字段，点击按列排序，选择Week_Code，保存后切片器按1-7排序

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实现方式二： 

  添加计算列weekday2，表达式如下：

weekday2 = Format('Bonus'[FROM_DATE],"DDDD")

　　效果与方式一一样。

 　　但是这个表达式不适用于直连模式

         

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实践 #2 - 历史周显示每周最后一天的数据，本周显示所有天的数据
 需求： 添加WeekFilter，过去周显示每周最后一天的数据，本周显示所有天的数据

实现步骤：
Step1 - 写SQL在D_Date表里添加Week_code

CASE
 WHEN DAY_OF_WEEK = 'Sunday' THEN 1
 WHEN DAY_OF_WEEK = 'Monday' THEN 2
 WHEN DAY_OF_WEEK = 'Tuesday' THEN 3
 WHEN DAY_OF_WEEK = 'Wednesday' THEN 4
 WHEN DAY_OF_WEEK = 'Thursday' THEN 5
 WHEN DAY_OF_WEEK = 'Friday' THEN 6
 WHEN DAY_OF_WEEK = 'Saturday' THEN 7 --Saturday 为每周最后一天
END AS WEEK_CODE

Step2 - 在D_Date表添加计算列，将本周的weekcode置为 7

Week_Filter =
Var dateweek = YEAR('D_DATE'[DAY_DATE])*100 + WEEKNUM('D_DATE'[DAY_DATE])
Var thisweek= YEAR(NOW()) *100 + WEEKNUM(NOW())
RETURN
IF(dateweek = thisweek,7,'D_DATE'[WEEK_CODE])

Step3 - 在视图页面添加Filter ，Week_code = 7
实现结果：

感谢所有指点小萌新的大神们。。。