如何从数据库获取上周和上个月的注册用户

Question

I have a table where i have users registration date column I am trying to get last week & last month registered users but don't know how it will work.Here are the other queries which works:

$users_today = $db_con->query("SELECT COUNT(*) as reg_date FROM users WHERE DATE(reg_date) = CURDATE()")->fetchColumn();
$users_yesterday = $db_con->query("SELECT COUNT(*) as reg_date FROM users WHERE reg_date=SUBDATE(CURDATE(), 1)")->fetchColumn();
$users_this_week = $db_con->query("SELECT COUNT(*) as reg_date FROM users WHERE WEEK(reg_date) = WEEK(CURRENT_DATE())")->fetchColumn();
$users_month = $db_con->query("SELECT COUNT(*) as reg_date FROM users WHERE MONTH(reg_date) = MONTH(CURRENT_DATE())")->fetchColumn();
$users_year = $db_con->query("SELECT COUNT(*) as reg_date FROM users WHERE YEAR(reg_date) = YEAR(CURRENT_DATE())")->fetchColumn();
$users_total = $db_con->query('SELECT COUNT(*) FROM users')->fetchColumn(); 

The week starts on Monday. And Please Let me know are these queries safe to work with (avoid SQL Vulnerability) or any other better suggestions to make these safe.

Answer 1

If you define last week as being the most recent 7 days before today:

$users_last_week = $db_con->query("SELECT COUNT(*) as reg_date 
  FROM users 
  WHERE reg_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 7 DAY)
  AND DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY)")->fetchColumn();

If you define last week as being the most recent 7 days which start on Monday and end on Sunday and any of them is before today:

$users_last_week = $db_con->query("SELECT COUNT(*) as reg_date 
  FROM users 
  WHERE reg_date BETWEEN SUBDATE(CURRENT_DATE(), INTERVAL 7 + WEEKDAY(CURRENT_DATE()) DAY)
  AND SUBDATE(CURRENT_DATE(), INTERVAL 1+WEEKDAY(CURRENT_DATE()) DAY)")->fetchColumn();

If you define last month as being the most recent 30 days before today:

$users_last_month = $db_con->query("SELECT COUNT(*) as reg_date 
  FROM users 
  WHERE reg_date BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 30 DAY)
  AND DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY)")->fetchColumn();

If you define last month as being the calendar month which is before the current month:

$users_last_month = $db_con->query("SELECT COUNT(*) as reg_date 
  FROM users 
  WHERE reg_date BETWEEN DATE_SUB(DATE_SUB(CURRENT_DATE(), INTERVAL DAY(CURRENT_DATE())-1 DAY), INTERVAL 1 MONTH)
  AND DATE_SUB(CURRENT_DATE(), INTERVAL DAY(CURRENT_DATE()) DAY)")->fetchColumn();

UPDATE

Regarding remarks for wrong results - removed 1 day from the right bound for LAST WEEK and added 1 day to the left bound for LAST MONTH.

UPDATE 2

To get the registrations for current week only:

$users_this_week = $db_con->query("SELECT COUNT(*) as reg_date 
  FROM users 
  WHERE reg_date BETWEEN SUBDATE(CURRENT_DATE(), INTERVAL WEEKDAY(CURRENT_DATE()) DAY)
  AND CURRENT_DATE()")->fetchColumn();