每月彙整：十二月 2021

YOUTUBE SQL 3hr https://www.youtube.com/watch?v=gvRXjsrpCHw constraints 限制約束 unique 唯一 not null auto_increment ———————————- set sql_safe_updates=0; create table `student`( `student_id` INT PRIMARY KEY, `name` varchare(20), `major` varchare(20), `score` INT ); select * from `student`; update `student` set `major` = ‘英語文學’ WHERE `major` … 繼續閱讀 →