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I have the following table<br />
<br />
A &nbsp;B &nbsp; ID<br />
1 &nbsp;8 &nbsp; &nbsp;s<br />
4 &nbsp;9 &nbsp; &nbsp;x<br />
5 &nbsp;10 &nbsp; m<br />
6 &nbsp;11 &nbsp;n<br />
7 &nbsp;12 &nbsp; o<br />
<br />
I want to calculated weighte average as follows<br />
only for IDs &nbsp;s and x i want to find weighted average 1/sum(all Bs) and 4/sum of all Bs<br />
<br />
what is the query for this?
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I have the following table

A  B   ID
1  8    s
4  9    x
5  10   m
6  11  n
7  12   o

I want to calculated weighte average as follows
only for IDs  s and x i want to find weighted average 1/sum(all Bs) and 4/sum of all Bs

what is the query for this?

weighted average

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Microsoft SQL Server

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