[Solved] Why does this Hibernate Criteria Query fails with \"No explicit selection and an implicit one cold not be determined\"?

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:
ALTER TABLE `Bucket` ADD INDEX `bucket_idx_name` (`Name`);
The optimized query:
SELECT
        generatedAlias0.generatedAlias0 
    FROM
        com.test.Bucket AS generatedAlias0 
    WHERE
        EXISTS (
            SELECT
                generatedAlias1.generatedAlias1 
            FROM
                com.test.Bucket AS generatedAlias1 
            WHERE
                generatedAlias1.Name = :param0
        )

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* original question posted on StackOverflow here.