Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table users (
id int primary key auto_increment,
name varchar(255) unique
);
create table chats (
id int primary key auto_increment
);
create table chat_user (
id int primary key auto_increment,
user_id int,
chat_id int,
foreign key (user_id) references users(id),
foreign key (chat_id) references chats(id)
);
select ch1.chat_id
from chat_user ch1
join chat_user ch2 using (chat_id)
where ch1.user_id = 1 and ch2.user_id = 2;
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