基本sql 语句

好久没写sql了，发现基本语法都忘了，复习下
mysql> create table a(
    -> id INT,
    -> name varchar(20)
    -> );

mysql> create table b(
    -> id INT,
    -> store INT
    -> );

 insert into a (id,name) values(1,'a');
 insert into a (id,name) values(2,'b');
 insert into a (id,name) values(3,'b');

update b set store=22 where id=2;

delete from b where id=2;