How to find the average of Bfid Value using thhe below query in Sql Server?

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SQL-Server-2005

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My query as follows;

SQL

 select distinct r.rate As Rate,f.bfid as BFid,
CASE  WHEN r.rate = '1' THEN '100'
 WHEN r.rate = '2' THEN '75' 
WHEN r.rate = '3' THEN '50'
 WHEN r.rate = '4' THEN '25' END AS Translated_Rate 
FROM bthfac AS f,batch b,facfeedback r where f.facid= '60,75,6' 
and f.Bthid=b.Bthid and r.bfid = f.bfid and b.class= 'PST'  
and year(b.examdate)= '2011' and month(b.examdate)= '10'

when i execute the above query output as follows

Rate    Bfid  Translated_Rate
1	72	100
2	72	75
3	72	50
4	72	25
1	74	100
2	74	75
3	74	50

from the above query i want the output as follows;

Rate   Bfid
 2.5    72
 2      74

how i done 2.5 means add the 72 Bfid rate 1+2+3+4 = 10 divide by no of 72's.

no of 72's is 4, so 10 divide by 4 is 2.5.

from the above Average calculation how can i do using my above query in sql server.

please help me.

Regards,
Narasiman P.

Posted 17-May-13 22:08pm

Member 8054539

Updated 20-May-13 2:32am

Mohammed Hameed

v4

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David_Wimbley · Answer 1 · 2013-05-19T07:07:00

I tired to build your schema into a sample DB but what you've got just doesn't make sense for me so i did my best.

By doing calculations off your result set, you are getting into more complex queries so you've got a few options. You could dump your data into a temp table (#tablename), table variable (@tablename), or use your select query as a table itself (WITH TableName AS (SELECT * FROM TableName). I chose to do it using the with clause.

SQL

 WITH ResultSet AS (
	SELECT DISTINCT 
		r.rate As Rate,
		f.bfid as BFid,
		CASE  
			WHEN r.rate = '1' THEN '100'
			WHEN r.rate = '2' THEN '75' 
			WHEN r.rate = '3' THEN '50'
			WHEN r.rate = '4' THEN '25' END AS Translated_Rate 
	FROM bthfac AS f,batch b,facfeedback r 
	WHERE f.facid= '60,75,6' 
		and f.Bthid=b.Bthid 
		and r.bfid = f.bfid 
		and b.class= 'PST' 
		and year(b.examdate)= '2011' 
		and month(b.examdate)= '10'
)

SELECT 
*,
	(SELECT SUM(CAST(Rate as float)) / COUNT(*) FROM ResultSet WHERE BFid = '72')
FROM ResultSet

This "should" work. With what i was able to manage with your schema in replicating it...i swapped out table names/and i dont know data types so thats why i say "should". The CAST Rate as Float is there since i dont know if you have rate as an integer/float/or a varchar in your db.

Masoom Mir · Answer 2 · 2013-05-20T02:11:00

Solution 2

SQL

SELECT AVG(Rate) as Rate, Bfid
FROM bthfac
GROUP BY bfid

rate must be float or decimal(18,2)

Posted 20-May-13 2:11am

Masoom Mir

Updated 20-May-13 9:08am

v3

Comments

Maciej Los 20-May-13 15:08pm

+5!