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Understanding EXISTS

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Lines changed: 9 additions & 0 deletions

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	`1`	`+CREATE TABLE customers(`
	`2`	`+ id INT PRIMARY KEY AUTO_INCREMENT, -- MySQL syntax`
	`3`	`+ -- id SERIAL PRIMARY KEY, --PostgreSQL syntax`
	`4`	`+ first_name VARCHAR(200),`
	`5`	`+ last_name VARCHAR(200),`
	`6`	`+ email VARCHAR(200)`
	`7`	`+);`
	`8`	`+`
	`9`	`+CREATE TABLE orders(`
	`10`	`+ id INT PRIMARY KEY AUTO_INCREMENT, -- MySQL syntax`
	`11`	`+ -- id SERIAL PRIMARY KEY, --PostgreSQL syntax`
	`12`	`+ amount_billed NUMERIC(5, 2),`
	`13`	`+ customer_id INT REFERENCES customers`
	`14`	`+);`

Lines changed: 8 additions & 0 deletions

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	`1`	`+INSERT INTO customers(first_name, last_name, email)`
	`2`	`+VALUES`
	`3`	`+ ('Max', 'Schwarz', 'max@test.com'),`
	`4`	`+ ('Manu', 'Lorenz', 'manu@test.com'),`
	`5`	`+ ('Julia', 'Meyers', 'juli@test.com');`
	`6`	`+`
	`7`	`+INSERT INTO orders(amount_billed, customer_id)`
	`8`	`+VALUES (48.99,1), (27.45, 2), (19.49, 1), (8.49, 3);`

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