如何在SQL中随机选择行？

问题描述：

我使用MSSQL Server 2005.在我的db，我有一个表customerNames，有两列Id和名称和约。 1,000个结果。

I am using MSSQL Server 2005. In my db, I have a table "customerNames" which has two columns "Id" and "Name" and approx. 1,000 results.

我创建了一个功能，我必须随机选择5个客户。任何人都可以告诉我如何创建一个查询，每次执行查询时都会得到随机的5行（Id和Name）。

I am creating a functionality where I have to pick 5 customers randomly every time. Can anyone tell me how to create a query which will get random 5 rows (Id, and Name) every time when query is executed?

答

SELECT TOP 5 Id, Name FROM customerNames
ORDER BY NEWID()

也就是说，每个人似乎都来到这个页面来获得更一般的答案：

That said, everybody seems to come to this page for the more general answer to your question:

SELECT column FROM table
ORDER BY RAND()
LIMIT 1

使用PostgreSQL选择一个随机行：

Select a random row with PostgreSQL:

SELECT column FROM table
ORDER BY RANDOM()
LIMIT 1

使用Microsoft SQL Server选择一个随机行：

Select a random row with Microsoft SQL Server:

SELECT TOP 1 column FROM table
ORDER BY NEWID()

使用IBM DB2选择随机行

Select a random row with IBM DB2

SELECT column, RAND() as IDX 
FROM table 
ORDER BY IDX FETCH FIRST 1 ROWS ONLY

使用Oracle选择随机记录：

Select a random record with Oracle:

SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_random.value )
WHERE rownum = 1

使用sqlite选择一个随机行：

Select a random row with sqlite:

SELECT column FROM table 
ORDER BY RANDOM() LIMIT 1