Updating First Field Based on the First of Grouped Rows

Question

Updating First Field Based on the First of Grouped Rows

tinausa

SSCrazy

Points: 2697
More actions
June 13, 2013 at 12:47 pm

#273827

I have the following table.
MonthEmpNumProdintRateYTDRate
11111prd123.123240814
21111prd221.205388462
31111prd120.789172069
41111prd123.566112884
51111prd222.669155099
12222prd420.054345462
22222prd122.369777067
32222prd21.256.345834007
42222prd123.496047561
52222prd124.054220056
62222prd222.760099161
23333prd21.253.934591185
33333prd222.220853136
43333prd121.71819
53333prd21.251.083734747
63333prd21.253.84453072
I wrote the following query to find the first month in which YTDRate > intRate by Prod and by employee No.
SELECT MIN(t1.Trans_Month) as Trans_Month,
t1.EmpNum,
t1.Prod,
t1.intRate,
t1.YTDRate
FROM Sales_Data t1
JOIN (SELECT Trans_Month,
EmpNum,
Prod,
intRate,
YTDRate
FROM Sales_Data t2
where YTDRate > intRate
GROUP BY Trans_Month, t2.EmpNum, Prod, intRate, YTDRate) t3 ON
t3.EmpNum = t1.EmpNum
AND t3.YTDRate = t1.YTDRate
AND t3.intRate = t1.intRate
AND t3.Prod = t1.Prod
AND t3.Trans_Month = t1.Trans_Month
GROUP BY t1.Trans_Month, t1.EmpNum, t1.Prod, t1.YTDRate, t1.intRate
Now I want to update a field Status with text "Exceeds intRate". How do I modify the queyr to do the update?
Any help would be greatly appreciated.
Thanks

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Luis Cazares SSC Guru Points: 183706 More actions · Answer 1

I'm not sure what you're trying to do, I might need some expected results based on the data you provided. To get better help, you should post DDL and consumable sample data. I'm helping you with this, but in order to help you with your problem, you must give more information.

DECLARE @Sales_Data TABLE(

Trans_Monthint,

empnumint,

prodchar(4),

intRatedecimal(15,9),

YTDRatedecimal(15,9))

INSERT @Sales_Data

VALUES

(1, 1111, 'prd1', 2, 3.123240814),

(2, 1111, 'prd2', 2, 1.205388462),

(3, 1111, 'prd1', 2, 0.789172069),

(4, 1111, 'prd1', 2, 3.566112884),

(5, 1111, 'prd2', 2, 2.669155099),

(1, 2222, 'prd4', 2, 0.054345462),

(2, 2222, 'prd1', 2, 2.369777067),

(3, 2222, 'prd2', 1.25, 6.345834007),

(4, 2222, 'prd1', 2, 3.496047561),

(5, 2222, 'prd1', 2, 4.054220056),

(6, 2222, 'prd2', 2, 2.760099161),

(2, 3333, 'prd2', 1.25, 3.934591185),

(3, 3333, 'prd2', 2, 2.220853136),

(4, 3333, 'prd1', 2, 1.71819),

(5, 3333, 'prd2', 1.25, 1.083734747),

(6, 3333, 'prd2', 1.25, 3.84453072)

SELECT *

FROM @Sales_Data

Notice that the code you posted will give the same results without the aggregate. And basically the same results as your inner query.

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

tinausa SSCrazy Points: 2697 More actions · Answer 2

Thanks, what I want to do is for each employee and for each product i wan to find the first month where YTDRate > IntRate. If it is, update the status to "exceeds rate".

So for empNum = 1111, product = prd1 the first month is 1 whereas for prd2, the first month is 5.

For empNum = 2222, product = prd1 it is 2, but for prd2 it is 3

and for empNum = 3333 and prd2 the first month is 2.

For the above rows, status will be updated to "exceeds rate" but left null for other months even if

ytdRate > intRate.