Calculate difference between two dates in weeks

[Anonymous]

Hello experts! 

I hope you can help me with this (as I am quite new to Power BI):

I created a measure which shows TOTAL NEED QTY as per image

What I want is a calculation that will show me the biggest difference between 2 selected dates of the Total Need (both, positive and negative greater difference)

Example from the image above, the biggest negative difference from 1 week to the other is BEKANT and the biggest positive difference is BILLY

RANGE	Need Week 30	Need Week 31	Difference
BEKANT	527879	524333	-3546
BILLY	832887	834909	2022
EKEDALEN	50569	50798	229
GALANT	158730	158852	122
NEXUS	0	0	0
REPVÅG	190768	191262	494
STOCKHOLM	40227	40534	307

Is this possible lads?
Thanks a lot in advance,

Regards,

Alan.

[TeigeGao]

Hi @Anonymous ,

Could you please share the expected result to us for analysis? Besides, you can share the original data to us for analysis.

Best Regards,

Teige

[Anonymous]

Hello @TeigeGao,

Basically what I need is the following:

YEAR WEEK	NEED	NEED DIF PCS	NEED DIF %
2019 26	955,589
2019 27	993,322	37,733	4%
2019 28	910,235	-83,087	-8%
2019 29	836,998	-73,237	-8%
2019 30	846,793	9,795	1%
2019 31	833,641	-13,152	-2%
2019 32	636,781	-196,860	-24%
2019 33	615,317	-21,464	-3%

I need to calculate the difference in pieces and % from one week to another but also to be able to do it even if comparing NON consecutive weeks (for instance, comparing week 26 to 30 and 33):

YEAR WEEK	NEED	NEED DIF PCS	NEED DIF %
2019 26	955,589
2019 30	846,793	-108,796	-11%
2019 33	615,317	-231,476	-27%

• Fact table is 'SPI_NEED':
  • Dates on this table are under a column named [SPI_DATE] and it goes week by week (eg.: 01/01/19; 08/01/19; 15/01/19 and so on)
  • I created a measure named NEED TOTAL = SUM(SPI_NEED[NEED])
• Table containing full date ranges is 'CALENDAR' and column with dates is [DATE] running from 01/01/19 till 31/12/19

I don't know if this is enough for you or not otherwise let me know so I can help you to help me out :). This is my very first post so I am not fully aware of the "ways of working". Apologies for that in advance.

Anyhow, thanks a lot for your time, much appreciated.

Cheers.
Alan.