Question

我一直试图找出如何编写SQL查询以获取上周在系统中注册的用户数。这是我现在的问题：

SELECT count(id) FROM profile WHERE registration_date BETWEEN $week_ago AND $current_date

它呈现错误。使用的php变量在这里定义：

$week_ago = date('Y m d H:i:s', strtotime('-1 week'));
$current_date = date('Y m d H:i:s', time());

我做错了什么？

Answer 1

您可以在纯SQL中执行此操作

SELECT count(id) 
FROM profile 
WHERE registration_date BETWEEN now() -  interval 7 day 
                            AND now()

Answer 2

我不确定你的php，但你可以在sql中执行此操作：

SELECT count(id) 
FROM profile 
WHERE registration_date 
BETWEEN NOW() - INTERVAL 7 DAY 
  AND NOW()

Answer 3

SQL中的

如下所示

SELECT count(id) 
FROM profile 
WHERE registration_date BETWEEN (Cast(GetDate() as date)-7)
                            AND Cast(GetDate() as date)

或者你也试试这个

SELECT count(id) 
FROM profile 
WHERE registration_date >= (Cast(GetDate() as date)-7)
                            AND registration_date <= Cast(GetDate() as date)

Answer 4

在SQL语句中使用$ week_ago和$ current_date周围的引号。

SELECT count(id) FROM profile WHERE registration_date BETWEEN '$week_ago' AND '$current_date'

是今天和上周之间的数据库中的日期

4 个答案: