select username from users where userid='1' or userid='2'
select username from users where userid=1 or userid=2
select users.userid,users.username, products.productname from users,products where users.productid=products.productid
insert into users (userid,username) values (600,'user-600')
update users set sofi=45
select * from users where productid in (select product id from products where productname like 'Ico%')
select count(userid), username, productid from users group by productid having userid>10 order by productid
select products.productname as product,count(users.userid) as quantity from users,products where users.productid=products.productid group by product having quantity>10 order by product desc
select * from users order by #userid asc, productid desc