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Minimum Value 3 Fields > 0


Minimum Value 3 Fields > 0

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This seems like it should be easy but I can't seem to come up with a simple formula. Need the minimum value where answer > 0.

Result:


1 = 1
2 = 4
3 = 3
4 = 1
5 = 2
6 = 1


CREATE TABLE #MinAmt
(Id int, A int, B int, C int)

INSERT INTO #MinAmt
(Id,A,B,C)
SELECT 1,1,2,3 UNION ALL
SELECT 2,4,5,6 UNION ALL
SELECT 3,0,2,3 UNION ALL
SELECT 4,1,2,0 UNION ALL
SELECT 5,-1,2,3 UNION ALL
SELECT 6,1,2,-3







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For ID = 3, the answer should be 2 not 3, right?
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Yes 2, sorry



Michael Valentine Jones
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select
ID,
[MinVal] = (
select
min(x)
from
(
select x=A where A > 0 union all
select x=B where B > 0 union all
select x=C where C > 0
) m
)
from
#MinAmt
order by
ID


Results:

ID MinVal
----------- -----------
1 1
2 4
3 2
4 1
5 2
6 1

(6 row(s) affected)

texpic
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SS thanks



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sogou34 (9/10/2012)

-------- http://www.chic-goods.us/ -----------

hello,This is a wholesaler's web site.

---blah blah


Reported.


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dwain.c
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Another way:


;WITH MyValues AS (
SELECT Id
,A=CASE WHEN A > 0 THEN A ELSE 2147483647 END
,B=CASE WHEN B > 0 THEN B ELSE 2147483647 END
,C=CASE WHEN C > 0 THEN C ELSE 2147483647 END
FROM #MinAmt)
SELECT Id
,MinAmt=CASE
WHEN A < B THEN CASE WHEN A < C THEN A ELSE C END
WHEN B < A THEN CASE WHEN B < C THEN B ELSE C END
ELSE CASE WHEN C < A THEN C ELSE A END END
FROM MyValues




BTW. You didn't specify what to return if all values are <= 0.


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Michael Valentine Jones
Michael Valentine Jones
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dwain.c (9/12/2012)
Another way:


;WITH MyValues AS (
SELECT Id
,A=CASE WHEN A > 0 THEN A ELSE 2147483647 END
,B=CASE WHEN B > 0 THEN B ELSE 2147483647 END
,C=CASE WHEN C > 0 THEN C ELSE 2147483647 END
FROM #MinAmt)
SELECT Id
,MinAmt=CASE
WHEN A < B THEN CASE WHEN A < C THEN A ELSE C END
WHEN B < A THEN CASE WHEN B < C THEN B ELSE C END
ELSE CASE WHEN C < A THEN C ELSE A END END
FROM MyValues




BTW. You didn't specify what to return if all values are <= 0.


You also need to deal with the case where the values are null.

You code returns 2147483647 when they are all <1 or null, and I doubt that is what they would want.

Returning a null probably makes the most sense for that case.
dwain.c
dwain.c
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Michael Valentine Jones (9/12/2012)
dwain.c (9/12/2012)
Another way:


;WITH MyValues AS (
SELECT Id
,A=CASE WHEN A > 0 THEN A ELSE 2147483647 END
,B=CASE WHEN B > 0 THEN B ELSE 2147483647 END
,C=CASE WHEN C > 0 THEN C ELSE 2147483647 END
FROM #MinAmt)
SELECT Id
,MinAmt=CASE
WHEN A < B THEN CASE WHEN A < C THEN A ELSE C END
WHEN B < A THEN CASE WHEN B < C THEN B ELSE C END
ELSE CASE WHEN C < A THEN C ELSE A END END
FROM MyValues




BTW. You didn't specify what to return if all values are <= 0.


You also need to deal with the case where the values are null.

You code returns 2147483647 when they are all <1 or null, and I doubt that is what they would want.

Returning a null probably makes the most sense for that case.



That's why I asked what the OP wanted for that case. Easy enough to wrap another CASE around the whole result like:


CASE WHEN [longer case] IS 2147483647 THEN NULL ELSE [longer case] END




Or if that seems too messy, put my CASE into a CROSS APPLY and just return that result to this latest CASE.


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Michael Valentine Jones
Michael Valentine Jones
SSCertifiable
SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)SSCertifiable (5.9K reputation)

Group: General Forum Members
Points: 5922 Visits: 11771
dwain.c (9/12/2012)
Michael Valentine Jones (9/12/2012)
dwain.c (9/12/2012)
Another way:


;WITH MyValues AS (
SELECT Id
,A=CASE WHEN A > 0 THEN A ELSE 2147483647 END
,B=CASE WHEN B > 0 THEN B ELSE 2147483647 END
,C=CASE WHEN C > 0 THEN C ELSE 2147483647 END
FROM #MinAmt)
SELECT Id
,MinAmt=CASE
WHEN A < B THEN CASE WHEN A < C THEN A ELSE C END
WHEN B < A THEN CASE WHEN B < C THEN B ELSE C END
ELSE CASE WHEN C < A THEN C ELSE A END END
FROM MyValues




BTW. You didn't specify what to return if all values are <= 0.


You also need to deal with the case where the values are null.

You code returns 2147483647 when they are all <1 or null, and I doubt that is what they would want.

Returning a null probably makes the most sense for that case.



That's why I asked what the OP wanted for that case. Easy enough to wrap another CASE around the whole result like:


CASE WHEN [longer case] IS 2147483647 THEN NULL ELSE [longer case] END




Or if that seems too messy, put my CASE into a CROSS APPLY and just return that result to this latest CASE.


Wrapping it in NULLIF([longer case],2147483647) would be simpler.

Of course, if one of the values in the table was actually 2147483647, it would return a null, so you might need extra code to deal with that:

WITH MyValues AS (
SELECT Id
,A=CASE WHEN A > 0 THEN A ELSE 3000000000000 END
,B=CASE WHEN B > 0 THEN B ELSE 3000000000000 END
,C=CASE WHEN C > 0 THEN C ELSE 3000000000000 END
FROM #MinAmt)
SELECT Id
,MinAmt=
convert(int,nullif(
CASE
WHEN A < B THEN CASE WHEN A < C THEN A ELSE C END
WHEN B < A THEN CASE WHEN B < C THEN B ELSE C END
ELSE CASE WHEN C < A THEN C ELSE A END END
,3000000000000))
FROM MyValues


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