Update statement getting error "Subquery returned more than 1 value"

Hello, I need to update a field in a table with data from another table and am getting an error. What's wrong with my statement?

Update #TempMyQuotes
set SOPNumber = (Select b.SOPNumber
from BB_OrderHeader b, #TempMyQuotes a
Where a.QuoteNumber = b.QuoteNumber)


Error Message:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.

gogetsomeAsked:
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Aneesh RetnakaranDatabase AdministratorCommented:
your subquery is returning more than one values


Update #TempMyQuotes
set SOPNumber = (Select MAX(b.SOPNumber)
from BB_OrderHeader b, #TempMyQuotes a
Where a.QuoteNumber = b.QuoteNumber)
0
gogetsomeAuthor Commented:
Thanks for responding Aneeshattingal!
That statement updated all rows with the Max SOPNumber from BB_OrderHeader.

Each row in #TempMyQuotes may or may not have a corresponding row in bb_OrderHeader. The unique key between the two tables is QuoteNumber. If there is a QuoteNumber in #TempMyQuotes  and in bb_OrderHeader I need to update #TempMyQuotes .SOPNumber with the bb_OrderHeader.SOPNumber...
The SOPNumber tells the user that the Quote has been ordered.

0
Aneesh RetnakaranDatabase AdministratorCommented:
Update a
set SOPNumber = MAX(b.SOPNumber)
from BB_OrderHeader b
INNER JOIN #TempMyQuotes a
ON a.QuoteNumber = b.QuoteNumber

0

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gogetsomeAuthor Commented:
I think I have to do one update at a time via a looping method?? if so how can I accomplish that?
0
gogetsomeAuthor Commented:
Strike that last comment.

This worked after I remove the max

Update a
set SOPNumber = (b.SOPNumber)
from BB_OrderHeader b
INNER JOIN #TempMyQuotes a
ON a.QuoteNumber = b.QuoteNumber
0
Aneesh RetnakaranDatabase AdministratorCommented:
oops, i forgot to remove that MAX() part :( ....
0
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