[Solved] SQL Server Query retrieves incorrect value

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.
  2. Use Numeric Column Types For Numeric Values (query line: 23): Referencing a numeric value (e.g. 581280193) as a string in a WHERE clause might result in poor performance. Possible impacts of storing numbers as varchars: more space will be used, you won't be able to perform arithmetic operations, the data won't be self-validated, aggregation functions like SUM won't work, the output may sort incorrectly and more. If the column is numeric, remove the quotes from the constant value, to make sure a numeric comparison is done.
Optimal indexes for this query:
CREATE INDEX transaction_detail_idx_line_descr_av_id_transactio ON transaction_detail (line_object_description,av_transaction_id,transaction_date);
The optimized query:
        round(SUM((t1.gross_line_amount - t1.pos_discount_amount)),
        2) AS total_amount_with_discount,
        2) AS total_amount,
        2) AS total_discount,
        2) AS total_sales_tax 
        transaction_detail AS t1 
        transaction_detail AS t2 
            ON t1.av_transaction_id = t2.av_transaction_id 
            AND t1.transaction_date = t2.transaction_date 
            t1.sku_id IS NOT NULL 
            OR t1.line_action_display_descr = 'sold'
        AND t2.line_object_description = 'S6 Sales Tax' 
        AND t1.av_transaction_id = '581280193' 

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* original question posted on StackOverflow here.