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Mysql – Optimizing INNER JOINS SQL query

I have a query like this: SELECT DISTINCTROW customers.id, customers.customer_name FROM customers INNER JOIN rentals ON customers.id = rentals.id_customer INNER JOIN rentals_billing ON rentals.id = rentals_billing.id_rental INNER JOIN vehicles ON vehicles.id = rentals.id_vehicle WHERE (rentals_billing.customer_id_facsimile IS NULL AND rentals_billing.rental_payable =…

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Reactjs – Application fails to start when I add a custom method in Repository interface

My application runs fine when it doesn't include any custom method in Repository. The moment I add a custom repo method in repo interface, it gives exceptions and application fails to start. package com.library.repo; import java.util.List; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.Query;…

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