Returning parameter from a select statement

How do I return the below to a parameter:


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Select @ReturnCOID = COID from Order.
Note that this must return only one row.

If more than one row can be a candidate, either use a WHERE clause, TOP 1, MAX() with GROUP BY, etc.

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Tapan PattanaikSenior EngineerCommented:

it should like

select @ReturnCOID=COID  FROM Order .
Important in dbbisshop's comment
"Note that this must return only one row"

If that is possible causing problems there are ways around that , but see they still give a correct value in all cases for what you intend to do.
Some examples
Select @ReturnCOID = max(COID) from Order

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Select @ReturnCOID = top 1 COID from Order order by orderdate desc

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Microsoft SQL Server

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