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CREATE TABLE courses (
id INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
nmax INTEGER NOT NULL,
title TEXT,
ctype TEXT,
teacher TEXT,
location TEXT
);
CREATE TABLE users (
id TEXT PRIMARY KEY NOT NULL,
name TEXT,
email TEXT,
department TEXT,
session TEXT,
expr INTEGER
);
CREATE TABLE choices (
PRIMARY KEY (userid, courseid),
seltime BIGINT NOT NULL, -- microseconds
userid TEXT NOT NULL,
courseid INTEGER NOT NULL,
FOREIGN KEY(userid) REFERENCES users(id),
FOREIGN KEY(courseid) REFERENCES courses(id)
);
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