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CREATE TABLE people( person_id INTEGER NOT NULL PRIMARY KEY ,name VARCHAR(6) NOT NULL ); INSERT INTO people(person_id,name) VALUES (1,'John'); INSERT INTO people(person_id,name) VALUES (2,'Alice'); INSERT INTO people(person_id,name) VALUES (3,'Mary'); CREATE TABLE sales( sales_id INTEGER NOT NULL PRIMARY KEY ,customer_id VARCHAR(6) NOT NULL ,type VARCHAR(6) NOT NULL ,amount VARCHAR(6) NOT NULL ); INSERT INTO sales(sales_id,customer_id,type,amount) VALUES (1,1,'credit',100); INSERT INTO sales(sales_id,customer_id,type,amount) VALUES (2,3,'cash',200);
select name,amount from people left join sales on sales.customer_id = people.person_id where sales.type = 'credit'
name
amount
John
100