lab SQL basics, added sollutions.sql

solutions.sql

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+-- Query 1
+SELECT client_id FROM client WHERE district_id = 1 ORDER BY client_id ASC LIMIT 5;
+
+-- Query 2
+SELECT client_id FROM client WHERE district_id = 72 ORDER BY client_id DESC LIMIT 1;
+
+-- Query 3
+SELECT amount FROM loan ORDER BY amount ASC LIMIT 3;
+
+-- Query 4 
+SELECT DISTINCT status FROM loan ORDER BY status ASC;
+
+-- Query 5
+SELECT loan_id FROM loan ORDER BY payments DESC LIMIT 1;
+
+-- Query 6
+SELECT account_id, amount FROM loan ORDER BY account_id ASC LIMIT 5;
+
+-- Query 7 
+SELECT account_id FROM loan WHERE duration = 60 ORDER BY amount ASC LIMIT 5;
+
+-- Query 8 
+SELECT DISTINCT k_symbol FROM "order" WHERE k_symbol IS NOT NULL ORDER BY k_symbol ASC;
+
+-- Query 9 
+SELECT order_id FROM "order" WHERE account_id = 34;
+
+-- Query  10
+SELECT DISTINCT account_id FROM "order" WHERE order_id BETWEEN 29540 AND 29560 ORDER BY account_id ASC;
+
+-- Query 11
+SELECT DISTINCT amount FROM "order" WHERE account_to = 30067122;
+
+-- Query 12
+SELECT trans_id, date, type, amount FROM trans WHERE account_id = 793 ORDER BY date DESC LIMIT 10;
+
+-- Query 13
+SELECT district_id, COUNT(*) AS num_clients FROM client WHERE district_id < 10 GROUP BY district_id ORDER BY district_id ASC;
+
+-- Query 14
+SELECT type, COUNT(*) AS num_cards FROM card GROUP BY type ORDER BY num_cards DESC;
+
+--Query 15
+SELECT account_id, SUM(amount) AS total_amount FROM loan GROUP BY account_id ORDER BY total_amount DESC LIMIT 10;
+
+-- Query 16 
+SELECT date, COUNT(*) AS num_loans FROM loan WHERE date < 930907 GROUP BY date ORDER BY date DESC;
+
+-- Query 17
+SELECT date, duration, COUNT(*) AS num_loans FROM loan WHERE date BETWEEN 971201 AND 971231 GROUP BY date, duration ORDER BY date ASC, duration ASC;
+
+-- Query 18
+SELECT account_id, type, SUM(amount) AS total_amount FROM trans WHERE account_id = 396 GROUP BY account_id, type ORDER BY type ASC;