feat: erd for bank database. feat: task_2 finished

leistungsnachweis/task_2/queries.sql

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+-- 1)
+SELECT
+	emp_id,
+	fname,
+	lname
+FROM employee
+ORDER BY 
+	lname DESC,
+	fname;
+
+-- 2)
+SELECT 
+	account_id,
+	cust_id,
+	avail_balance
+FROM account
+WHERE
+	status = 'ACTIVE'
+AND
+	avail_balance > 2500;
+
+-- 3)
+SELECT DISTINCT(open_emp_id)
+FROM account;
+
+-- 4)
+SELECT COUNT(account_id)
+FROM account;
+
+-- 5)
+SELECT 
+	individual.fname,
+	individual.lname, 
+	COUNT(*)
+FROM individual
+JOIN account
+	ON individual.cust_id = account.cust_id
+GROUP BY 
+	individual.fname,
+	individual.lname;
+
+-- 6)
+SELECT 
+	individual.fname,
+	individual.lname, 
+	COUNT(*)
+FROM account
+JOIN individual
+	ON account.cust_id = individual.cust_id
+GROUP BY 
+	individual.fname,
+	individual.lname
+HAVING
+	COUNT(*) >= 2;
+
+-- 7)
+SELECT *
+FROM account
+WHERE EXTRACT(YEAR FROM open_date) = 2002;
+
+-- 8)
+SELECT *
+FROM individual
+WHERE lname LIKE '_a%e%';
+
+-- 9)
+SELECT 
+	account.account_id, 
+	customer.fed_id,
+	product.name
+FROM account
+JOIN individual
+	ON account.account_id = individual.cust_id
+JOIN customer
+	ON account.account_id = customer.cust_id
+JOIN product
+	ON account.product_cd = product.product_cd;
+
+-- 10)
+SELECT 
+	e.emp_id,
+	e.fname,
+	e.lname
+FROM employee e
+JOIN employee s
+	ON e.superior_emp_id = s.superior_emp_id
+JOIN department d1
+	ON e.dept_id = d1.dept_id
+JOIN department d2
+	ON s.superior_emp_id = d2.dept_id
+WHERE d1.dept_id <> d2.dept_id;
+
+-- 11)
+SELECT
+	i.fname,
+	i.lname
+FROM individual i
+UNION
+SELECT
+	e.fname,
+	e.lname
+FROM employee e;
+
+-- 12)
+SELECT
+	s.fname || ' ' || s.lname AS superior,
+	STRING_AGG(e.fname || ' ' || e.lname, ', ') AS employees
+FROM employee s
+JOIN employee e
+	ON e.superior_emp_id = s.emp_id
+GROUP BY s.fname, s.lname;
+
+-- 13)
+SELECT
+	a.account_id,
+	a.cust_id,
+	COALESCE(b.name, i.fname || ' ' || i.lname)
+FROM account a
+JOIN customer c
+	ON a.cust_id = c.cust_id
+LEFT JOIN business b
+	ON c.cust_id = b.cust_id
+LEFT JOIN individual i
+	ON c.cust_id = i.cust_id;
+
+-- 14)
+SELECT
+	COALESCE(b.name, i.fname || ' ' || i.lname) customer_name
+FROM (
+		SELECT 
+			cust_id, 
+			SUM(avail_balance) AS balance
+		FROM account
+		GROUP BY cust_id
+		ORDER BY balance DESC
+		LIMIT 1
+	) top_customer
+JOIN customer c
+	ON top_customer.cust_id = c.cust_id
+LEFT JOIN business b
+	ON c.cust_id = b.cust_id
+LEFT JOIN individual i
+	ON c.cust_id = i.cust_id;
+
+-- 15)
+SELECT 
+	a.account_id, 
+	p.name
+FROM account a
+FULL JOIN product p
+	ON a.product_cd = p.product_cd