[Solved] Is this query safe 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 table1_idx_id ON table1 (id);
The optimized query:
SELECT
        table1.field1 
    FROM
        table1 
    WHERE
        table1.id NOT IN (
            SELECT
                table2.table1id 
            FROM
                table2
        )

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* original question posted on StackOverflow here.