[Solved] Update records in the same table searching for common records in another table

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 `do11_doctestata` ADD INDEX `do11_doctestata_idx_do11_mg36` (`do11_docum_mg36`);
ALTER TABLE `do30_doccorpo` ADD INDEX `do30_doccorpo_idx_do30_cg18_do30_co99` (`do30_ditta_cg18`,`do30_numreg_co99`);
ALTER TABLE `do33_doccorporif` ADD INDEX `do33_doccorporif_idx_do33_numnsdoc` (`do33_numnsdoc`);
The optimized query:
SELECT
        do11_doctestata.do11_docum_mg36,
        do11_doctestata.do11_datadoc,
        do11_doctestata.do11_numdoc,
        do11_doctestata.do11_sezdoc,
        do33_doccorporif.do33_numnsdoc,
        do30_doccorpo.do30_codart_mg66,
        do30_doccorpo.do30_qta1,
        do30_doccorpo.do30_prezzo1,
        do30_doccorpo.do30_prezzo1iva,
        do30_doccorpo.do30_importo,
        do30_doccorpo.do30_importoiva,
        do30_doccorpo.do30_impnetscp 
    FROM
        do11_doctestata 
    INNER JOIN
        do33_doccorporif 
            ON do11_doctestata.do11_numdoc = do33_doccorporif.do33_numnsdoc 
    INNER JOIN
        do30_doccorpo 
            ON do11_doctestata.do11_ditta_cg18 = do30_doccorpo.do30_ditta_cg18 
            AND do11_doctestata.do11_numreg_co99 = do30_doccorpo.do30_numreg_co99 
    WHERE
        (
            do11_doctestata.do11_docum_mg36 = 'FOR-DDT'
        )

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