SELECT * FROM ( sum(number*(1-abs(sign(subject-1)))) as sub1,sum(number*(1-abs(sign(subject-2)))) as sub2, sum(number*(1-abs(sign(subject-4)))) as sub4,
我正在使用以下代码来确定用户是否已登录,我已经在mysql表中将字段'first_sign_in‘设置为0,但我仍然收到回显'already for the day’,而实际上它应该返回'not signed= mysql_query("SELECT first_sign_in from staff WHERE pin = 3012");
if ($checkifuse