[Solved] native query doesn\'t work in spring jpa repository but works in mysql

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. Avoid Selecting Unnecessary Columns (query line: 2): Avoid selecting all columns with the '*' wildcard, unless you intend to use them all. Selecting redundant columns may result in unnecessary performance degradation.
  2. 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 `follow_shop` ADD INDEX `follow_shop_idx_shop_id` (`shop_id`);
ALTER TABLE `shop` ADD INDEX `shop_idx_id_bellscore` (`id`,`bellscore`);
The optimized query:
SELECT
        * 
    FROM
        shop 
    WHERE
        shop.id IN (
            SELECT
                * 
            FROM
                (SELECT
                    fs.shop_id 
                FROM
                    follow_shop fs 
                GROUP BY
                    fs.shop_id 
                ORDER BY
                    count(fs.shop_id) DESC LIMIT 3) AS pp) 
            ORDER BY
                shop.bellscore DESC

Related Articles



* original question posted on StackOverflow here.