How can i get count of customers per day by unique and repeat customer for specific date?

Question

I am trying to get a result from my order table to get list of counts of customers who 1st time ordered and repeat orders. Something like below.

Date               


        

Answer 1

this is my answer but not sure is still can improve.

SELECT userID, COUNT(*) AS repeat_order_cnt FROM
(SELECT DATE(OrderDate) AS order_DT, userID, COUNT(*) AS no_of_order FROM order
AND YEAR(orderDate) = '2015'
AND MONTH(orderDate) = '01'
GROUP BY order_DT,userID) AS order2
GROUP BY userID
HAVING COUNT(*) > 1