Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table user_groups (
username varchar(64),
group_id int
);
alter table user_groups add unique index (username, group_id);
insert into user_groups values ('alex', 1);
insert into user_groups values ('alex', 2);
insert into user_groups values ('alex', 1);
insert into user_groups values ('ivan', 1);
select * from user_groups;
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