Calculating Yield

Question

Calculating Yield

kabaari

SSCrazy

Points: 2235
More actions
October 22, 2012 at 3:43 pm

#263606

Hi all,
I'm running into an issue calculating yield. ;with totalcount as (
select
cast(count(sn) as decimal) as total
from completedUnit
)
select
(100 - (cast(count(distinct sn) as decimal)/(select * from totalcount))*100) as 'yield'
from productiondefect
The following works however, I need to group weekly and by operator
This does not work
;with totalcount as (
select
cast(count(sn) as decimal) as total
from completedUnit
)
select
(100 - (cast(count(distinct sn) as decimal)/(select * from totalcount))*100) as 'yield'
from productiondefect
where sn = (select c.sn
from completedUnit as c
join productiondefect as d on c.sn = d.sn
where c.operator = 'Operator')

Viewing 6 posts - 1 through 5 (of 5 total)

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kabaari SSCrazy Points: 2235 More actions · Answer 1

Ok. I got the below to run. The formula returns weekly defects / overall production totals. I want to calculate weekly defect / weekly production. Is this possible?

;with totalcount as (

select

cast(count(sn) as decimal) as total

from completedUnit

where MONTH(dateentered) = '10' and operator = 'operator'

)

select

(100 - (cast(count(distinct d.sn) as decimal)/(select * from totalcount))*100) as 'yield'

from productiondefect as d

join completedUnit as c on d.sn = c.sn

where MONTH(c.dateentered) = '10' and c.operator = 'operator'

GROUP BY DATEADD(wk, DATEDIFF(wk, 7, c.dateentered), 7)

ORDER BY DATEADD(wk, DATEDIFF(wk, 7, c.dateentered), 7)

kabaari SSCrazy Points: 2235 More actions · Answer 2

Below are my results:

yield

94.4000000000000000

97.6000000000000000

98.4000000000000000

96.8000000000000000

Now, I need to get rid of the zeros and show dates.

Luis Cazares SSC Guru Points: 183698 More actions · Answer 3

kabaari (10/24/2012)
Below are my results:
yield
94.4000000000000000
97.6000000000000000
98.4000000000000000
96.8000000000000000
Now, I need to get rid of the zeros and show dates.

You should do formatting on the front end.

But if you must do it here, an easy way is

CAST( yield AS decimal( 3,1))

Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

How to post data/code on a forum to get the best help: Option 1 / Option 2

Luis Cazares SSC Guru Points: 183698 More actions · Answer 4

kabaari (10/24/2012)
Ok. I got the below to run. The formula returns weekly defects / overall production totals. I want to calculate weekly defect / weekly production. Is this possible?

To help you, we need to know more about this. You should provide DDL and sample data.

You can read how to post it and obtain better responses in the article linked in my signature.

Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

How to post data/code on a forum to get the best help: Option 1 / Option 2

kabaari SSCrazy Points: 2235 More actions · Answer 5

kabaari

SSCrazy

Points: 2235

October 29, 2012 at 2:00 pm

#1553895

thanks Luis.