排序更新问题

[xs0573]

之前做了个更新程序：

update 考勤表 set 考勤表.bc2 = 调班表.bc,考勤表.blb = case when 调班表.blb >0 then 调班表.blb end from 调班表 inner join 考勤表 on 调班表.ny = 考勤表.ny
and 调班表.xm = 考勤表.xm where 考勤表.ny = @ny and 考勤表.rq >= 调班表.rq1 and 考勤表.rq <= 调班表.rq2

后来发现，需要按照调班表里面的输入时间rq 升序更新
请问如何实现比较有效率
目前的sql 版本是2000
谢谢

[中国风]

后来发现，需要按照调班表里面的输入时间rq 升序更新?

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能列出点数据看看么？

[xs0573]

调班表数据
ny dh rq xm rq1 rq2 bc blb bz
1203 1 2012-3-13 14:43:52 陈加宙 2012-3-8 2012-3-8 11 0
1203 1 2012-3-13 14:44:14 陈加宙 2012-3-8 2012-3-8 11 3
1203 1 2012-3-13 14:51:06 陈加宙 2012-3-9 2012-3-9 11 0
1203 1 2012-3-13 14:51:27 陈加宙 2012-3-9 2012-3-9 11 3
如果按照之前的做法更新，陈加宙 3月9日的班类别blb 可能就是3了
如果按照输入时间rq排序后更新就没有问题

[中国风]

UPDATE  b
SET     b.bc2 = a.bc ,
        b.blb = a.blb
FROM    调班表 AS a
        INNER JOIN 考勤表  as b ON a.ny = b.ny
                          AND a.xm = b.xm
WHERE   b.ny = @ny
        AND a.rq1=(SELECT TOP 1 rq1 FROM 调班表 WHERE ny=b.ny AND xm=b.xm AND b.rq>=rq1 AND b.rq<=rq2 ORDER BY rq1 desc)

楼主测试一下结果

[xs0573]

谢谢
UPDATE b
SET b.bc2 = a.bc ,
b.blb = a.blb
FROM 调班表 AS a
INNER JOIN 考勤表 as b ON a.ny = b.ny
AND a.xm = b.xm
WHERE b.ny = @ny
AND a.rq=(SELECT TOP 1 rq FROM 调班表 WHERE ny=b.ny AND xm=b.xm AND b.rq>=rq1 AND b.rq<=rq2 ORDER BY rq1)
这样就比较接近了，晚上回去再试试 =。=