如何在 SQL 中请求随机行? [英] How to request a random row in SQL?
问题描述
如何在纯 SQL 中请求随机行(或尽可能接近真正随机)?
How can I request a random row (or as close to truly random as is possible) in pure SQL?
推荐答案
查看此帖子:SQL to从数据库表中随机选择一行.它通过在 MySQL、PostgreSQL、Microsoft SQL Server、IBM DB2 和 Oracle 中执行此操作的方法(以下内容从该链接复制):
See this post: SQL to Select a random row from a database table. It goes through methods for doing this in MySQL, PostgreSQL, Microsoft SQL Server, IBM DB2 and Oracle (the following is copied from that link):
使用 MySQL 随机选择一行:
Select a random row with MySQL:
SELECT column FROM table
ORDER BY RAND()
LIMIT 1
使用 PostgreSQL 随机选择一行:
Select a random row with PostgreSQL:
SELECT column FROM table
ORDER BY RANDOM()
LIMIT 1
使用 Microsoft SQL Server 随机选择一行:
Select a random row with Microsoft SQL Server:
SELECT TOP 1 column FROM table
ORDER BY NEWID()
使用 IBM DB2 随机选择一行
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 随机选择一条记录:
Select a random record with Oracle:
SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_random.value )
WHERE rownum = 1
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