),))
  )
as
begin
  )
  --如果@nameA 不为空则直接返回@nameA
  IF @nameA <>''
      BEGIN
       set @lastNameVal = @nameA
      END
  ELSE
  --否则如果@nameA是空则返回nameB，经测试兼容null和''
      begin
         set @lastNameVal = @nameB
      end
  return @lastNameVal
end