如何从MS Access数据库中选择随机行？ [英] How can I select random rows from MS Access Database?

问题描述

你好。



我正在开发一个圣经琐事游戏。

我有一个带QUESTIONID（整数）的QUESTIONS表，QUESTIONSTMT （字符串）2列，以及其中的一些行。我想选择随机的10个问题来执行游戏。



我搜索了一些页面，并看到了一个解决方案：

Hello.

I am developing a holy bible trivia game.
I have a QUESTIONS table with QUESTIONID(integer),QUESTIONSTMT(string) 2 columns, and some rows in it. I want to select random 10 questions for executing the game.

I've searched some page, and see a solution:

SELECT TOP n * FROM Table WHERE [conditions] ORDER BY RND([number col])

但是当我使用时在我的代码中，它抛出一个异常，我没有为参数赋值。



我怎么能解决这个问题？

but when I use it in my code, it throws an exception that I didn't give a value for a parameter.

How could I solve this problem?

推荐答案

你可以使用这样的东西

You could use something like this

SELECT TOP 10 QUESTIONID,QUESTIONSTMT FROM QUESTIONS ORDER BY RND(1217*QUESTIONID)

1217只是一个数字，可以是零以外的任何数字。

1217 is just a number, could be anything except zero.

尝试ORDER BY new guid（你必须查找如何为Access生成新的GUID）。它将每次生成唯一的guid，从而以随机方式对您的前n个查询进行排序。



如果这有帮助，请花时间接受解决方案。谢谢。

Try ORDER BY new guid (you'll have to look up how to generate new GUID for Access). It will generate unique guid each time and thus sort your top n query in random fashion.

If this helps please take time to accept the solution. Thank you.

请查看您的查询：

Please, have a look at your query:

SELECT TOP n *
FROM Table
WHERE [conditions]
ORDER BY RND([number col])

我看到几个问题：

1）如果 n 是参数，你需要定义它（见下文）。

2）表是保留字 [ ^ ]。我建议更改表名。

3） [条件] - 能够使用 WHERE语句 [ ^ ]，你应该至少提供一个列名和比较运算符

I see few issues:
1) If n is parameter, you need to define it (see below).
2) Table is reserved word[^]. I'd suggest to change the table name.
3) [conditions] - to be able to use conditions in WHERE statement[^], you should provide at least a column name and comparison operator

WHERE ColumnName <operator> [condition]

4） RND（[number col]）未知MS Access，因为 Rnd [ ^ ]不接受任何输入参数。

顺便说一下： ORDER BY声明 [ ^ ]参数的行为类似于 WHERE 声明。



所以...

如果你想获得10个随机数，您需要编写一个查询，如下所述：

如何在Microsoft的SQL查询中创建随机数访问？ [ ^ ]

在查询中创建一个randon唯一编号字段 [ ^ ]

4) RND([number col]) is not known for MS Access, because Rnd[^] does not accept any input parameter.
By The Way: ORDER BY statement[^] with parameters behaves like WHERE statement.

So...
If you want to get 10 random numbers, you need to write a query, as is described here:
How to create a random number in an SQL query on Microsoft Access?[^]
Create a randon unique number field in a query[^]

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