Question

I am relatively new with sql and I need some help with some basic query construction.

Problem: To retrieve the number of orders and the customer id from a table based on a set of parameters.

I want to write a query to figure out the number of orders under each customer (Column: Customerid) along with the CustomerID where the number of orders should be greater or equal to 10 and the status of the order should be Active. Moreover, I also want to know the first transaction date of an order belonging to each customerid.

Table Description:

product_orders

Orderid CustomerId Transaction_date Status
------- ---------- ---------------- -------
 1       23         2-2-10          Active
 2       22         2-3-10          Active
 3       23         2-3-10          Deleted
 4       23         2-3-10          Active

Query that I have written:

select count(*), customerid
  from product_orders
 where status = 'Active'
 GROUP BY customerid
 ORDER BY customerid;

The above statement gives me

• the sum of all order under a customer
  id but does not fulfil the condition
  of atleast 10 orders.
• I donot know how
  to display the first transaction date
  along with the order under a
  customerid (status: could be active
  or delelted doesn’t matter)

Ideal solutions should look like:

Total Orders CustomerID Transaction Date (the first transaction date)
------------ ---------- ----------------
11           23         1-2-10

Thanks in advance. I hope you guys would be kind enough to stop by and help me out.

Cheers,

Leonidas

Answer 1

SELECT
    COUNT(*) AS [Total Orders],
    CustomerID,
    MIN(Transaction_date) AS [Transaction Date]
FROM product_orders
WHERE product_orders.Status = 'Active'
GROUP BY
    CustomerId
HAVING COUNT(*) >= 10