MySQL建表，设立字段自动获取当前时间
MySQL建表，设置字段自动获取当前时间
CREATE TABLE comment_user (
user_account VARCHAR (60),
user_name VARCHAR (60),
comment_content VARCHAR (500),
comment_time TIMESTAMP not NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE comment_user (
user_account VARCHAR (60),
user_name VARCHAR (60),
comment_content VARCHAR (500),
comment_time TIMESTAMP not NULL DEFAULT CURRENT_TIMESTAMP
);