SELECT * FROM `password` WHERE expiration = '2020-01-01 00:00:00';
UPDATE `password` SET expiration = '2021-01-01 00:00:00' WHERE expiration = '2020-01-01 00:00:00'

azok a regisztráltak, akik regisztrációja unregdate-kor jár le

SELECT `mac`,`pid`,`category_id`,`regdate`,`unregdate`,`status`,`computername` FROM `node` WHERE `status`='reg' AND category_id>0 AND `unregdate`= '2021-01-01 00:00:00' ;

SELECT `mac`,`pid`,`category_id`,`regdate`,`unregdate`,`status`,`computername` FROM `node` WHERE `unregdate` > '2020-01-01 00:00:00' AND category_id <> 2 AND pid='default' ORDER BY `unregdate`;

mikor kapott dhcp-t utoljára

SELECT mac,pid,category_id,unregdate,`status`,computername,last_dhcp FROM node WHERE last_dhcp > '2020-01-01 00:00:00' ORDER BY last_dhcp;

SELECT mac,pid,category_id,regdate,unregdate,`status`,computername,last_dhcp FROM node WHERE last_dhcp < '2019-01-01 00:00:00' AND STATUS='reg' ORDER BY last_dhcp DESC;
SELECT COUNT(*) FROM node WHERE last_dhcp < '2019-01-01 00:00:00' AND STATUS='unreg' ORDER BY last_dhcp DESC;