mysql查看当前时间

select current_timestamp from dual;
select current_timestamp();
select current_time  from dual;
select current_time();
select current_date from dual;
select current_date();
select now()  from dual;
select now();
select curdate() from dual;
select curtime();

将当前时间插入数据库
insert into tt(user_id,login_time) values (1,CURRENT_TIMESTAMP);