power BI应用技巧

持续跟新

1.函数日期表

使用高级编辑器—M函数（把下面代码直接复制即可）

版本1：前单位写的M函数，日期是2021年开始的

letdate=(optional 请输入开始年份 as number,optional 请输入结束年份 as number)=>letx = 请输入开始年份,y = if 请输入结束年份 = null then 请输入开始年份 else 请输入结束年份,begin_date = if x = null then #date(Date.Year(DateTime.LocalNow()),1,1) else #date(x,1,1),end_date = if y = null then #date(Date.Year(DateTime.LocalNow()),12,31) else #date(y,12,31),list = {1..Number.From(end_date)-Number.From(begin_date)+1},dates = List.Transform( list , (item)=> Date.AddDays(begin_date,item-1) ),table = Table.TransformColumnTypes(Table.RenameColumns(Table.FromList(dates, Splitter.SplitByNothing(), null, null, ExtraValues.Error),{{"Column1", "日期"}}),{{"日期", type date}}),date_id = Table.TransformColumnTypes(Table.AddColumn(table, "日期序号", each Date.Year([日期])*10000+Date.Month([日期])*100+Date.Day([日期])),{{"日期序号", type number}}),year_id = Table.AddColumn(date_id, "年序号", each Date.Year([日期]), type number),year_name = Table.AddColumn(year_id, "年份名称", each Text.From([年序号]) & "年"),quarter_id = Table.AddColumn(year_name, "季度序号", each Date.QuarterOfYear([日期]), type number),quarter_name = Table.AddColumn(quarter_id, "季度名称", each Text.From([季度序号])& "季"),month_id = Table.AddColumn(quarter_name, "月份序号", each Date.Month([日期]), type number),month_name = Table.AddColumn(month_id, "月份名称", each Text.From([月份序号])& "月"),week_id = Table.AddColumn(month_name, "周序号", each Date.WeekOfYear([日期]), type number),week_name = Table.AddColumn(week_id, "周名称", each "W"&Text.From([周序号])),year_quarter_id = Table.AddColumn(week_name, "年季序号", each Date.Year([日期])*10+Date.QuarterOfYear([日期]), type number),year_quarter_name = Table.AddColumn(year_quarter_id, "年季名称", each Text.From([年序号])&"年"&Text.From([季度序号])&"季"),year_month_id = Table.AddColumn(year_quarter_name, "年月序号", each Date.Year([日期])*100+ Date.Month([日期]), type number),year_month_name = Table.AddColumn(year_month_id, "年月名称", each Text.From([年序号])& "年" &Text.From([月份序号])& "月"),year_week_id = Table.AddColumn(year_month_name, "年周序号", each Date.Year([日期])*100+ Date.WeekOfYear([日期]), type number),#"year_week-name" = Table.AddColumn(year_week_id, "年周名称", each Text.From([年序号]) & "年"&Text.From([周序号])&"周"),day_in_week_id = Table.AddColumn(#"year_week-name", "日序号", each Date.DayOfWeek([日期],0), type number),day_in_week_name = Table.AddColumn(day_in_week_id, "周天名称", each if [日序号] = 1 then "WD1" else
if [日序号] = 2 then "WD2" else
if [日序号] = 3 then "WD3" else
if [日序号] = 4 then "WD4" else
if [日序号] = 5 then "WD5" else
if [日序号] = 6 then "WD6" else
"WD7"),work_day = Table.AddColumn(day_in_week_name , "工作日", each if [日序号] = 6 or [日序号] = 0 then "休息日" else "工作日" )
inwork_dayin date( 2021 , Date.Year( DateTime.LocalNow() ))

版本2：参考@Fabric白茶文档 ，这里就不复制了，需要的可以参考链接(https://www.yuque.com/powerplat/ai1yri/yvk3gc)。

版本3：使用表函数

1.在建模窗口下，选择新建表格

2.修改表名之后，复制代码

日期表 =
GENERATE (CALENDAR ( MIN ( '调用的函数'[日期] ), MAX ( '调用的函数'[日期] ) ),VAR DA = [Date]VAR YEAR =YEAR ( DA )VAR QUARTER = "季度" & FORMAT ( DA, "Q" )VAR MONTE =FORMAT ( DA, "MM" ) & "月"VAR DAY =DAY ( DA )VAR WEEKID =WEEKDAY ( DA, 2 )RETURNROW ("年度", YEAR,"季度", QUARTER,"月份", MONTE,"日", DAY,"年度季度", YEAR & QUARTER,"年度月份", YEAR & MONTE,"星期", WEEKID)
)

2.同比环比

同比：2022年1月与2023年1月比较；

环比：2022年2月与2022年1月比较：

直接上案例：计算库存金额的同比？(环比同理，YEAR改成MONTH)

1.库存金额 = 
SWITCH(SELECTEDVALUE('PAT还原口径'[ID],1) --默认还原后, 1 , [库存金额.还原后], 2 , [库存金额.还原前]
)
2.库存金额.上年 = CALCULATE([库存金额],DATEADD('DIM日期'[日期],-1,YEAR))
3.库存金额.同比 = [库存金额]-[库存金额.上年]