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

I am hoping someone can explain how to correctly update multiple records in a table using subqueries.

I have one table that 2 fields. The subqueries are returning the correct values for the set and the Where Exists is returning the correct records to update.

any help is greatly appreciated.

UPDATE    TempFinalTubeListMoves
	SET              DestRackRow =
							  (SELECT     TempRecompileLastRackPositions.Row AS DestRackRow
								FROM          TempLastDestRack INNER JOIN
													   TempRecompileLastRackPositions ON TempLastDestRack.Ident = TempRecompileLastRackPositions.Ident INNER JOIN
													   TempFinalTubeListMoves AS TempFinalTubeListMoves ON TempLastDestRack.bc = TempFinalTubeListMoves.bc), 
						  DestRackColumn =
							  (SELECT     TempRecompileLastRackPositions.Col AS DestRackCol
								FROM          TempLastDestRack AS TempLastDestRack INNER JOIN
													   TempRecompileLastRackPositions AS TempRecompileLastRackPositions ON 
													   TempLastDestRack.Ident = TempRecompileLastRackPositions.Ident INNER JOIN
													   TempFinalTubeListMoves AS TempFinalTubeListMoves ON TempLastDestRack.bc = TempFinalTubeListMoves.bc)
	WHERE  EXISTS  
							  (SELECT     *
								FROM          TempLastDestRack AS TempLastDestRack INNER JOIN
													   TempRecompileLastRackPositions AS TempRecompileLastRackPositions ON 
													   TempLastDestRack.Ident = TempRecompileLastRackPositions.Ident INNER JOIN
													   TempFinalTubeListMoves AS TempFinalTubeListMoves ON TempLastDestRack.bc = TempFinalTubeListMoves.bc)

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