Lab SQL Basics - Relearning Selection, Filtering and Aggregation in SQLite

files_for_lab/solutions.sql

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+-- LAB: SQL Basics (Selection and Aggregation)
+-- Database: lab1_bank.sqlite
+
+-- 1. Get the first 5 client IDs from district_id = 1
+SELECT client_id
+FROM client
+WHERE district_id = 1
+ORDER BY client_id ASC
+LIMIT 5;
+
+-- 2. Get the last client ID where district_id = 72
+SELECT client_id
+FROM client
+WHERE district_id = 72
+ORDER BY client_id DESC
+LIMIT 1;
+
+-- 3. Return the 3 lowest loan amounts
+SELECT amount
+FROM loan
+ORDER BY amount ASC
+LIMIT 3;
+
+-- 4. List all distinct loan status values
+SELECT DISTINCT status
+FROM loan
+ORDER BY status ASC;
+
+-- 5. Get the loan_id with the highest payment
+SELECT loan_id
+FROM loan
+ORDER BY payments DESC
+LIMIT 1;
+
+-- 6. Show account_id and amount for the first 5 accounts by ID
+SELECT account_id, amount
+FROM loan
+ORDER BY account_id ASC
+LIMIT 5;
+
+-- 7. Show 5 lowest loan amounts with duration = 60
+SELECT account_id, amount
+FROM loan
+WHERE duration = 60
+ORDER BY amount ASC
+LIMIT 5;
+
+-- 8. Get all unique k_symbol values from orders
+SELECT DISTINCT k_symbol
+FROM `order`
+ORDER BY k_symbol ASC;
+
+-- 9. List all order IDs for account_id = 34
+SELECT order_id
+FROM `order`
+WHERE account_id = 34
+ORDER BY order_id ASC;
+
+-- 10. Show unique account IDs for orders between IDs 29540 and 29560
+SELECT DISTINCT account_id
+FROM `order`
+WHERE order_id BETWEEN 29540 AND 29560
+ORDER BY account_id ASC;
+
+-- 11. Show all amounts sent to account_to = 30067122
+SELECT amount
+FROM `order`
+WHERE account_to = 30067122;
+
+-- 12. Get the 10 most recent transactions for account_id = 793
+SELECT trans_id, date, type, amount
+FROM trans
+WHERE account_id = 793
+ORDER BY date DESC
+LIMIT 10;
+
+-- 13. Count clients by district_id where district_id < 10
+SELECT district_id, COUNT(client_id) AS client_count
+FROM client
+WHERE district_id < 10
+GROUP BY district_id
+ORDER BY district_id ASC;
+
+-- 14. Count cards per type, sorted by frequency
+SELECT type, COUNT(card_id) AS card_count
+FROM card
+GROUP BY type
+ORDER BY card_count DESC;
+
+-- 15. Top 10 account_ids by total loan amount
+SELECT account_id, SUM(amount) AS total_amount
+FROM loan
+GROUP BY account_id
+ORDER BY total_amount DESC
+LIMIT 10;
+
+-- 16. Number of loans per date before 930907
+SELECT date, COUNT(loan_id) AS loans_count
+FROM loan
+WHERE date < 930907
+GROUP BY date
+ORDER BY date DESC;
+
+-- 17. Loans count per duration and date during Dec 1997
+SELECT date, duration, COUNT(loan_id) AS loans_count
+FROM loan
+WHERE date BETWEEN 971201 AND 971231
+GROUP BY date, duration
+ORDER BY date ASC, duration ASC;
+
+-- 18. Total transaction amount by type for account_id = 396
+SELECT account_id, type, SUM(amount) AS total_amount
+FROM trans
+WHERE account_id = 396
+GROUP BY type
+ORDER BY type ASC;