Calculating a % based on multiple dates

jvsering

I would like to create a beast mode that calculates the % of the way we are into a campaign. In Excel, I would calculate this as =(TODAY()-'Start Date') / ('End Date' - 'Start Date')

Here's what I have so far (I want this to return a %):

(SUM(IFNULL(CURDATE(), 0) - IFNULL(`Start Date`, 0)) / NULLIF(SUM(IFNULL(`End Date`, 0) - IFNULL(`Start Date`, 0)), 0))

The formula validates fine but I get an error when I add it to a card.

marcel_luthi

A couple of questions:

1. What is the answer you would expect to get when a Campaign has no start date?
2. What should be the answer when a campaign has no end date?

In your dataset, what is the level of granularity you have? If this is a campaign level dataset, then a formula to cover the out of bond scenarios (no start date, not yet started, no end date and already ended) first, and then operate at the row level is likely best:

CASE
WHEN `StartDate` IS NULL THEN 0
WHEN `StartDate` > CURDATE() THEN 0
WHEN `EndDate` IS NULL THEN 0
WHEN `EndDate` < CURDATE() THEN 1
ELSE ROUND(((UNIX_TIMESTAMP(CURDATE())-UNIX_TIMESTAMP(`StartDate`))/86400)-0.5,0)/ROUND(((UNIX_TIMESTAMP(`EndDate`)-UNIX_TIMESTAMP(`StartDate`))/86400)-0.5,0) 
END 

You could try with DATEDIFF but that one is known to behave oddly sometimes, so the UNIX diff is often preferred and more reliable, feel free to try both.

ST_Superman

You could add a case statement

Case when curdate() > End Date then 1 else … end

where the … is your formula from above

ThomasPetroski

SUM(IFNULL(DATEDIFF(CURDATE(), 'Start Date'), 0)) / NULLIF(SUM(IFNULL(DATEDIFF('End Date', 'Start Date'), 0)), 0)

marcel_luthi

A couple of questions:

1. What is the answer you would expect to get when a Campaign has no start date?
2. What should be the answer when a campaign has no end date?

In your dataset, what is the level of granularity you have? If this is a campaign level dataset, then a formula to cover the out of bond scenarios (no start date, not yet started, no end date and already ended) first, and then operate at the row level is likely best:

CASE
WHEN `StartDate` IS NULL THEN 0
WHEN `StartDate` > CURDATE() THEN 0
WHEN `EndDate` IS NULL THEN 0
WHEN `EndDate` < CURDATE() THEN 1
ELSE ROUND(((UNIX_TIMESTAMP(CURDATE())-UNIX_TIMESTAMP(`StartDate`))/86400)-0.5,0)/ROUND(((UNIX_TIMESTAMP(`EndDate`)-UNIX_TIMESTAMP(`StartDate`))/86400)-0.5,0) 
END 

You could try with DATEDIFF but that one is known to behave oddly sometimes, so the UNIX diff is often preferred and more reliable, feel free to try both.

jvsering

Thanks for all the replies. I ended up going with:

DATEDIFF(CURDATE(), Start Date) / DATEDIFF(End Date, Start Date)

I would like to cap the results at 100%, can I get help with that?

ST_Superman

You could add a case statement

Case when curdate() > End Date then 1 else … end

where the … is your formula from above