Question: Comment on the following queries SQL - 1 : SELECT * FROM invoices i INNER JOIN cities c ON i . service _ city _

Comment on the following queries
SQL-1: SELECT * FROM invoices i INNER JOIN cities c ON i.service_city_code = c.city_code;
SQL-2: SELECT * FROM invoices i JOIN cities c ON i.service_city_code = c.city_code;
SQL-3: SELECT * FROM invoices i, cities c WHERE i.service_city_code = c.city_code;

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