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create table user_balance (
user_id int,
balance decimal(9, 2) check (balance >=0)
);
insert into user_balance values (1, 10);
update user_balance set balance = balance - 100 where user_id = 1;
create table user_balance_unsigned (
user_id int,
balance decimal(9, 2) unsigned
);
insert into user_balance_unsigned values (1, 10);
update user_balance_unsigned set balance = balance - 100 where user_id = 1;
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