
Mysql Download link: https://dev.mysql.com/downloads/installer/
alter table students add mob_num varchar(20);
update students set mob_num = '8888888888' where id=1;
update students set mob_num = '8888888889' where id=2;
update students set mob_num = '8888888887' where id=3;
update students set mob_num = '8888888886' where id=4;
update students set mob_num = '8888888882' where id=5;
alter table students modify name varchar(100);
alter table students modify mob_num varchar(20) unique;
alter table students drop column marks;
alter table students rename column name to full_name;
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