You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: workload.go
    path of file: ./repos/cockroach/pkg/workload/movr
    
    the code of the file until where you have to start completion: // Copyright 2019 The Cockroach Authors.
//
// Use of this software is governed by the Busi
    
func (m *movrWorker) getRandomUser(city string) (string, error) {
	id, err := uuid.NewV4()
	if err != nil {
		return "", err
	}
	var user string
	q := `
		SELECT
			IFNULL(a, b)
		FROM
			(
				SELECT
					(SELECT id FROM users WHERE city = $1 AND id > $2 ORDER BY id LIMIT 1)
						AS a,
					(SELECT id FROM users WHERE city = $1 ORDER BY id LIMIT 1) AS b
			);
		`
	err = m.db.QueryRow(q, city, id.String()).Scan(&user)
	return user, err
}