w5 d1 LAB | SQL basics

solutions.sql

@@ -0,0 +1,307 @@
+-- ============================================================
+-- Query 1
+-- Get the id values of the first 5 clients from district_id with a value equals to 1.
+-- Expected result:
+--   2
+--   3
+--   22
+--   23
+--   28
+-- ============================================================
+SELECT client_id
+FROM client
+WHERE district_id = 1
+ORDER BY client_id
+LIMIT 5;
+
+
+-- ============================================================
+-- Query 2
+-- In the client table, get an id value of the last client where the district_id equals to 72.
+-- Expected result:
+--   13576
+-- ============================================================
+SELECT client_id
+FROM client
+WHERE district_id = 72
+ORDER BY client_id DESC
+LIMIT 1;
+
+
+-- ============================================================
+-- Query 3
+-- Get the 3 lowest amounts in the loan table.
+-- Expected result:
+--   4980
+--   5148
+--   7656
+-- ============================================================
+SELECT amount
+FROM loan
+ORDER BY amount
+LIMIT 3;
+
+
+-- ============================================================
+-- Query 4
+-- What are the possible values for status, ordered alphabetically in ascending order in the loan table?
+-- Expected result:
+--   A
+--   B
+--   C
+--   D
+-- ============================================================
+SELECT DISTINCT status
+FROM loan
+ORDER BY status ASC;
+
+
+-- ============================================================
+-- Query 5
+-- What is the loan_id of the highest payment received in the loan table?
+-- Expected result:
+--   6415
+-- ============================================================
+SELECT loan_id
+FROM loan
+ORDER BY payments DESC
+LIMIT 1;
+
+
+-- ============================================================
+-- Query 6
+-- What is the loan amount of the lowest 5 account_ids in the loan table?
+-- Show the account_id and the corresponding amount.
+-- Expected result:
+--   #id     amount
+--   2       80952
+--   19      30276
+--   25      30276
+--   37      318480
+--   38      110736
+-- ============================================================
+SELECT account_id, amount
+FROM loan
+ORDER BY account_id ASC
+LIMIT 5;
+
+
+-- ============================================================
+-- Query 7
+-- What are the account_ids with the lowest loan amount that have a loan duration of 60 in the loan table?
+-- Expected result:
+--   10954
+--   938
+--   10711
+--   1766
+--   10799
+-- ============================================================
+SELECT account_id
+FROM loan
+WHERE duration = 60
+ORDER BY amount ASC
+LIMIT 5;
+
+
+-- ============================================================
+-- Query 8
+-- What are the unique values of k_symbol in the order table?
+-- Note: `order` is a reserved keyword — escape the table name with backticks.
+-- Expected result:
+--   LEASING
+--   POJISTNE
+--   SIPO
+--   UVER
+-- ============================================================
+SELECT DISTINCT k_symbol
+FROM `order`;
+
+
+-- ============================================================
+-- Query 9
+-- In the order table, what are the order_ids of the client with the account_id 34?
+-- Expected result:
+--   29445
+--   29446
+--   29447
+-- ============================================================
+SELECT order_id
+FROM `order`
+WHERE account_id = 34;
+
+
+-- ============================================================
+-- Query 10
+-- In the order table, which account_ids were responsible for orders between
+-- order_id 29540 and order_id 29560 (inclusive)?
+-- Expected result:
+--   88
+--   90
+--   96
+--   97
+-- ============================================================
+SELECT DISTINCT account_id
+FROM `order`
+WHERE order_id BETWEEN 29540 AND 29560
+ORDER BY account_id;
+
+
+-- ============================================================
+-- Query 11
+-- In the order table, what are the individual amounts that were sent to (account_to) id 30067122?
+-- Expected result:
+--   5123
+-- ============================================================
+SELECT amount
+FROM `order`
+WHERE account_to = 30067122;
+
+
+-- ============================================================
+-- Query 12
+-- In the trans table, show the trans_id, date, type and amount of the 10 first
+-- transactions from account_id 793 in chronological order, from newest to oldest.
+-- Expected result:
+--   3556468  981231  PRIJEM  78.6
+--   233254   981216  VYDAJ   600
+--   233104   981212  VYDAJ   1212
+--   233248   981211  VYDAJ   851
+--   233176   981207  VYDAJ   204
+--   3556467  981130  PRIJEM  75.1
+--   233395   981130  VYDAJ   14.6
+--   233103   981112  VYDAJ   1212
+--   233247   981111  VYDAJ   851
+--   233175   981107  VYDAJ   204
+-- ============================================================
+SELECT trans_id, date, type, amount
+FROM trans
+WHERE account_id = 793
+ORDER BY date DESC
+LIMIT 10;
+
+
+-- ============================================================
+-- Query 13
+-- In the client table, of all districts with a district_id lower than 10,
+-- how many clients are from each district_id? Sort by district_id ascending.
+-- Expected result:
+--   1  663
+--   2  46
+--   3  63
+--   4  50
+--   5  71
+--   6  53
+--   7  45
+--   8  69
+--   9  60
+-- ============================================================
+SELECT district_id, COUNT(*)
+FROM client
+WHERE district_id < 10
+GROUP BY district_id
+ORDER BY district_id ASC;
+
+
+-- ============================================================
+-- Query 14
+-- In the card table, how many cards exist for each type?
+-- Rank the result starting with the most frequent type.
+-- Expected result:
+--   classic  659
+--   junior   145
+--   gold     88
+-- ============================================================
+SELECT type, COUNT(*) AS total
+FROM card
+GROUP BY type
+ORDER BY total DESC;
+
+
+-- ============================================================
+-- Query 15
+-- Using the loan table, print the top 10 account_ids based on the sum of all of their loan amounts.
+-- Expected result:
+--   7542    590820
+--   8926    566640
+--   2335    541200
+--   817     538500
+--   2936    504000
+--   7049    495180
+--   10451   482940
+--   6950    475680
+--   7966    473280
+--   339     468060
+-- ============================================================
+SELECT account_id, SUM(amount) AS total_amount
+FROM loan
+GROUP BY account_id
+ORDER BY total_amount DESC
+LIMIT 10;
+
+
+-- ============================================================
+-- Query 16
+-- In the loan table, retrieve the number of loans issued for each day,
+-- before (excl) 930907, ordered by date in descending order.
+-- Expected result:
+--   930906  1
+--   930803  1
+--   930728  1
+--   930711  1
+--   930705  1
+-- ============================================================
+SELECT date, COUNT(*)
+FROM loan
+WHERE date < 930907
+GROUP BY date
+ORDER BY date DESC;
+
+
+-- ============================================================
+-- Query 17
+-- In the loan table, for each day in December 1997, count the number of loans
+-- issued for each unique loan duration, ordered by date and duration, both ascending.
+-- Ignore days without any loans.
+-- Expected result:
+--   971206  24  1
+--   971206  36  1
+--   971208  12  3
+--   971209  12  1
+--   971209  24  1
+--   971210  12  1
+--   971211  24  1
+--   971211  48  1
+--   971213  24  1
+--   971220  36  1
+--   971221  36  1
+--   971224  60  1
+--   971225  24  1
+--   971225  60  1
+--   971226  60  1
+--   971227  48  1
+--   971228  12  1
+--   971228  36  1
+--   971228  48  2
+--   971231  60  1
+-- ============================================================
+SELECT date, duration, COUNT(*)
+FROM loan
+WHERE date BETWEEN 971201 AND 971231
+GROUP BY date, duration
+ORDER BY date ASC, duration ASC;
+
+
+-- ============================================================
+-- Query 18
+-- In the trans table, for account_id 396, sum the amount of transactions for each type
+-- (VYDAJ = Outgoing, PRIJEM = Incoming). Output: account_id, type, sum of amount as total_amount.
+-- Sort alphabetically by type.
+-- Expected result:
+--   396  PRIJEM  1028138.6999740601
+--   396  VYDAJ   1485814.400024414
+-- ============================================================
+SELECT account_id, type, SUM(amount) AS total_amount
+FROM trans
+WHERE account_id = 396
+GROUP BY type
+ORDER BY type ASC;