Payments by Order Number
A reconciliation report needs to find rows in payments for each order by order_id; without help it scans payments again and again. Add an index on payments.order_id so payments for a specific order are found quickly.
Speed this query up with an index
SELECT * FROM orders o JOIN payments p ON p.order_id = o.id
Само CREATE/ALTER/DROP — без нужда от завършващ SELECT.
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