::fixture-ready::
$ sqlite3 app.db ".schema users"
CREATE TABLE users (
  id INTEGER PRIMARY KEY,
  email TEXT NOT NULL,
  created_at TEXT NOT NULL
);
CREATE UNIQUE INDEX idx_users_email ON users(email);
::exit-code::0
$ sqlite3 app.db "SELECT email, count(*) FROM users GROUP BY email HAVING count(*) > 1;"
alex@example.com|2
::exit-code::0