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Finding the percent SQL syntax

Posted on 2004-09-30
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Last Modified: 2008-03-10
Hello,

My last columns are trying to find the percent of items that contain a L or an R, you get the idea.  However, the only percent im coming up with is 0, any suggestions?

Thank You

SELECT
      LINNBR As "Number",
      COD As "Code",
      Convert(varchar, DAT, 101) As "Date",
      Left(CAGE, 2) As House,
      DateDiff("d", DAT, VAL) As "Age",
      Sum( Case When NBR <> 0 Then 1 End) As "Total_Count",
      Avg(BW) AS "Weight",
      Avg([BW]/DateDiff("d", DAT, VAL)) As "ADG",
      Avg(BC) As AvgBC,
      Avg(FE) As AvgFe,
      Sum( Case When Stat1 = 'E' Then 1 End) As "Elites",
      Avg( Case When Stat1 = 'E' Then (BWT1) End) As "Avg_Weight_E",
      (Sum( Case When Defects1 like '%L%' Then 1 else 0 End)) As "%L",
      100*(Sum( Case When Def like '%T%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%T",
      100*(Sum( Case When Def like '%K%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%K",
      100*(Sum( Case When Def like '%R%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%R",
      100*(Sum( Case When Def like '%V%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%V",
      100*(Sum( Case When Def like '%D%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%D",
      100*(Sum( Case When Def like '%S%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1 End)) As "%S"
FROM
      PSBRLEVLP
WHERE
      VAL <> ''
GROUP BY
      LINNBR,
      COD,
      DAT,
      Left(CAGE, 2),
      DateDiff("d", DAT, VAL)
0
Comment
Question by:Navicerts
6 Comments
 
LVL 15

Expert Comment

by:jdlambert1
ID: 12191741
You probably have some nulls, which sets it all null. Try substituting:

NULLIF(NBR, 0)

for

NBR
0
 
LVL 7

Author Comment

by:Navicerts
ID: 12191752
NBR is a keyed field that wont allow Null's
0
 
LVL 7

Author Comment

by:Navicerts
ID: 12191767
sorry,  you did mean i probally have null's in the NBR field right?
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LVL 17

Accepted Solution

by:
BillAn1 earned 500 total points
ID: 12191916
the SUM returns int, so SLQ treats the calculation as integers. You are dividng numerator by denom then multiplying by 100
e.g. 100 * ( 1234 / 1500) will give 100 * ( 0) = 0
try casting as floats (you can get away with only the numerator)

.....
   100.0 *( cast( Sum( Case When Def like '%T%' Then 1 else 0 End) as float) /Sum( Case When NBR <> 0 Then 1 End)) As "%T",
.....
0
 
LVL 34

Expert Comment

by:arbert
ID: 12191950
Possibly SQL Server's implicit conversion on the data type--try this:

100*(Sum( Case When Def like '%T%' Then 1 else 0 End)/Sum( Case When NBR <> 0 Then 1.00  End)) As "%T"
0
 
LVL 7

Author Comment

by:Navicerts
ID: 12193579
Cast worked great, thank you all for your input
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