SELECT date_trunc('week', users.created_at) AS "Week" , count(*) AS "No. of created users"
FROM users
WHERE users.created_at > now() - interval '12 months' 
GROUP BY 1
ORDER BY 1;
	
| Week                | No. Created Users | Created without email | Created without last name |

| 2016-01-04 | 200               | 85                    | 12                        |

| 2016-01-11 | 400               | 93                    | 29                        |

| 2016-01-18 | 150               | 84                    | 12                        |