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CREATE TABLE customers ( customer_id varchar2(50) , customer_name number(10) , city number(10), cust number(10) ); INSERT INTO customers ( customer_id, customer_name, city, cust) VALUES ('denis', 1, 1, 1); INSERT INTO customers ( customer_id, customer_name, city, cust) VALUES ('denis', 2, 1, 1); INSERT INTO customers ( customer_id, customer_name, city, cust) VALUES ('denis', 3, 0, 1); select * from customers where customer_name= city;

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