用游标，和WHILE可以遍历您的查询中的每一条记录并将要求的字段传给变量进行相应的处理
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代码
DECLARE @A1 VARCHAR(10),@A2 VARCHAR(10),@A3 INT
DECLARE YOUCURNAME CURSOR FOR SELECT A1,A2,A3 FROM YOUTABLENAME
OPEN YOUCURNAME
fetch next from youcurname into @a1,@a2,@a3
while @@fetch_status<>-1
begin
update ... set ...=@a1,...=a2 ...-a3 where ...
......您要执行的操作写在这里
end
close youcurname
deallocate youcurname