[Solved] Error inserting comma separated values in Table: SQL Server 2008

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 ticket_category_idx_ticket_uid ON ticket_category (ticket_uid);
The optimized query:
            DISTINCT convert(varchar(500),
            pr.category_id) + ',' AS [text()] 
            ticket_category pr 
            pr.ticket_uid = p.ticket_uid FOR XML PATH('')) AS Category_list 
        comment_mining p

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* original question posted on StackOverflow here.