--------------
UPDATE user_groups SET discount_percentage = 10.00 WHERE id = 1 AND name = 'Clienti'
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ERROR 1054 (42S22) at line 6: Unknown column 'discount_percentage' in 'SET'
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INSERT INTO product_group_prices (product_id, user_group_id, price)
SELECT
    gp.id AS product_id,
    1 AS user_group_id,
    ROUND(ps_p.price - sp.reduction, 2) AS price
FROM gibertini_dump1.ps_specific_price sp
JOIN gibertini_dump1.ps_product ps_p ON ps_p.id_product = sp.id_product
JOIN gibertini_prova.products gp ON gp.sku = ps_p.reference
WHERE sp.id_group = 3
  AND sp.reduction_type = 'amount'
  AND sp.id_shop = 1
  AND sp.id_customer = 0
  AND (ps_p.price - sp.reduction) > 0
ON DUPLICATE KEY UPDATE price = VALUES(price)
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ERROR 1146 (42S02) at line 11: Table 'gibertini_prova.product_group_prices' doesn't exist