[Solved] Managing / Using Constant Values in SQL Server

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.
Optimal indexes for this query:
CREATE INDEX order_idx_orderstatusid ON dbo.Order (OrderStatusID);
CREATE INDEX cvw_orderstatusid_idx_delivered ON dbo.cvw_OrderStatusID (Delivered);
The optimized query:
SELECT
        IIF(OS_OrderDelivered.[Match Exists] = 1,
        p.DeliveredDate,
        NULL) AS OrderDeliveryDate,
        ISNULL(OS_AllowEdit.[Match Exists],
        0) AS AllowEditing 
    FROM
        dbo.Order O 
    LEFT OUTER JOIN
        dbo.cvw_OrderStatusID OS_OrderDelivered 
            ON O.OrderStatusID = OS_OrderDelivered.[Delivered] 
    LEFT OUTER JOIN
        dbo.cvw_OrderStatusID OS_AllowEdit 
            ON O.OrderStatusID IN (
                OS_AllowEdit.[Draft],
            OS_AllowEdit.[New],
            OS_AllowEdit.[Open])

Related Articles



* original question posted on StackOverflow here.