Question

这段代码给我最后700条记录，而不是700条随机记录。

private string strsqlcommandBeta = " select top 700  LEFT(patronvalue17, INSTR(30, patronvalue17, ' ') -1) as patronvalue1,   Rnd([objectid]) AS Ran    from objectaer    " +
" order by objectdate desc" +
"  ";

Answer 1

我不在MS Access附近，但请试一试：

SELECT * FROM (
    SELECT top 700 LEFT(patronvalue17, INSTR(30, patronvalue17, ' ') -1) as patronvalue1, objectdate
    FROM objectaer
    ORDER BY Rnd([objectid]) ()
) order by objectdate desc

Rnd（[objectid]）应该给你一个随机数来排序，然后你按照你想要的那样排序。

Answer 2

SELECT * FROM (
    SELECT top 700 LEFT(patronvalue17, INSTR(30, patronvalue17, ' ') -1) as patronvalue1, objectdate
    FROM objectaer
    ORDER BY newid()
) order by objectdate desc

newid()函数生成一个随机guid，可用于对表进行排序，在每次运行时给出不同的结果。我不知道你是否真的需要外部选择，它用于按日期降序对随机项目进行排序

如何从访问表中选择700个随机记录？

2 个答案: