Question

我试图为我在1到60之间选择的每一行生成一个随机整数作为计时器。

SELECT downloads.date, products.*, (FLOOR(1 + RAND() * 60)) AS timer

我已经搜索并继续使用此FLOOR函数作为如何选择范围内的随机整数。这给了我每一行1。我错过了什么？

我在mysql 5.0.75

继续查询的其余部分我相信它可能是一个嵌套问题

SELECT *
FROM (
 SELECT downloads.date, products.*, FLOOR(1 + (RAND() * 60)) AS randomtimer, 
 (
 SELECT COUNT( * )
 FROM distros
 WHERE distros.product_id = products.product_id
 ) AS distro_count,

 (SELECT COUNT(*) FROM downloads WHERE downloads.product_id = products.product_id) AS true_downloads

 FROM downloads
 INNER JOIN products ON downloads.product_id = downloads.product_id
) AS count_table
WHERE count_table.distro_count > 0
AND count_table.active = 1
ORDER BY count_table.randomtimer , count_table.date DESC LIMIT 10

Answer 1

这对我有用。你的mysql版本可能吗？

SELECT id, (FLOOR( 1 + RAND( ) *60 )) AS timer
FROM users
LIMIT 0 , 30

Answer 2

我正在运行您的查询，它确实为每行提供了一个随机数....也许与随机（计时器）的名称有关？

Answer 3

RAND函数的输出将始终为 0 和 1 之间的值。

试试这个：

SELECT downloads.date, products.*, (CAST(RAND() * 60 AS UNSIGNED) + 1) AS timer

Answer 4

老问题，但总是实际问题。

这里有一种创建 MySQL 函数的方法 random_integer() based on manual :

CREATE FUNCTION random_integer(value_minimum INT, value_maximum INT)
RETURNS INT
COMMENT 'Gets a random integer between value_minimum and value_maximum, bounds included'
RETURN FLOOR(value_minimum + RAND() * (value_maximum - value_minimum + 1));

SELECT ALL random_integer(1, 60) AS timer;

Answer 5

您可以将数字乘以表格中的记录数量。

SELECT id,

(FLOOR( (SELECT MIN(id)                        FROM  your_table ) + RAND( ) * 1000000 ) ) AS timer
FROM your_table
LIMIT 0 , 30

如何获取mysql随机整数范围？

5 个答案: