commit 7782c6d85a1b856959563108e1f5fef1851697a9
parent 56c5046c13a423e9e07576b7190eca56d0fb93ff
Author: Dimitrije Dobrota <mail@dimitrijedobrota.com>
Date: Mon, 11 Dec 2023 21:17:29 +0000
6 Database Problems
Diffstat:
7 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/Problems/0550.sql b/Problems/0550.sql
@@ -0,0 +1,8 @@
+SELECT ROUND(COUNT(DISTINCT player_id) / (SELECT COUNT(DISTINCT player_id) FROM Activity), 2) AS fraction
+FROM Activity
+WHERE (player_id, DATE_SUB(event_date, INTERVAL 1 DAY)) IN (
+ SELECT player_id, MIN(event_date) as first_date
+ FROM Activity
+ GROUP BY player_id
+)
+
diff --git a/Problems/0570.sql b/Problems/0570.sql
@@ -0,0 +1,8 @@
+SELECT name
+FROM Employee E
+WHERE id IN (
+ SELECT managerId
+ FROM Employee
+ GROUP BY managerId
+ HAVING COUNT(managerId) >= 5
+)
diff --git a/Problems/1174.sql b/Problems/1174.sql
@@ -0,0 +1,7 @@
+SELECT ROUND(100 * AVG(order_date = customer_pref_delivery_date), 2) AS immediate_percentage
+FROM Delivery
+WHERE (customer_id, order_date) IN (
+ SELECT customer_id, MIN(order_date) as first_order
+ FROM Delivery
+ GROUP BY customer_id
+)
diff --git a/Problems/1193.sql b/Problems/1193.sql
@@ -0,0 +1,8 @@
+SELECT LEFT(trans_date, 7) AS month,
+ country,
+ COUNT(*) AS trans_count,
+ SUM(state = 'approved') AS approved_count,
+ SUM(amount) AS trans_total_amount,
+ SUM(if(state = 'approved', amount, 0)) AS approved_total_amount
+FROM Transactions
+GROUP BY YEAR(trans_date), MONTH(trans_date), country
diff --git a/Problems/1393.sql b/Problems/1393.sql
@@ -0,0 +1,10 @@
+SELECT
+ stock_name,
+ SUM(
+ CASE
+ WHEN operation = 'buy' THEN -price
+ WHEN operation = 'sell' THEN price
+ END
+ ) AS capital_gain_loss
+FROM Stocks
+GROUP BY stock_name
diff --git a/Problems/1934.sql b/Problems/1934.sql
@@ -0,0 +1,6 @@
+SELECT S.user_id,
+ ROUND(AVG(if(C.action="confirmed", 1, 0)), 2) AS confirmation_rate
+FROM Signups AS S
+LEFT JOIN Confirmations AS C
+ON S.user_id = C.user_id
+GROUP BY user_id;
diff --git a/README.md b/README.md
@@ -344,6 +344,7 @@ for solving problems.
| 0542 | Medium | [01 Matrix](Problems/0542.cpp) |
| 0543 | Easy | [Diameter of Binary Tree](Problems/0543.cpp) |
| 0547 | Medium | [Number of Provinces](Problems/0547.cpp) |
+| 0550 | Medium | [Game Play Analysis IV](Problems/0550.cpp) |
| 0553 | Medium | [Optimal Division](Problems/0553.cpp) |
| 0556 | Medium | [Next Greater Element III](Problems/0556.cpp) |
| 0557 | Easy | [Reverse Words in a String III](Problems/0557.cpp) |
@@ -353,6 +354,7 @@ for solving problems.
| 0563 | Easy | [Binary Tree Tilt](Problems/0563.cpp) |
| 0566 | Easy | [Reshape the Matrix](Problems/0566.cpp) |
| 0567 | Medium | [Permutation in String](Problems/0567.cpp) |
+| 0570 | Medium | [Managers with at Least 5 Direct Reports](Problems/0570.cpp) |
| 0572 | Easy | [Subtree of Another Tree](Problems/0572.cpp) |
| 0577 | Easy | [Employee Bonus](Problems/0577.cpp) |
| 0583 | Medium | [Delete Operation for Two Strings](Problems/0583.cpp) |
@@ -571,9 +573,11 @@ for solving problems.
| 1161 | Medium | [Maximum Level Sum of a Binary Tree](Problems/1161.cpp) |
| 1162 | Medium | [As Far from Land as Possible](Problems/1162.cpp) |
| 1170 | Medium | [Compare Strings by Frequency of the Smallest Character](Problems/1170.cpp) |
+| 1174 | Medium | [Immediate Food Delivery II](Problems/1174.cpp) |
| 1179 | Easy | [Reformat Department Table](Problems/1179.cpp) |
| 1187 | Hard | [Make Array Strictly Increasing](Problems/1187.cpp) |
| 1190 | Medium | [Reverse Substrings Between Each Pair of Parentheses](Problems/1190.cpp) |
+| 1193 | Medium | [Monthly Transactions I](Problems/1193.cpp) |
| 1202 | Medium | [Smallest String With Swaps](Problems/1202.cpp) |
| 1203 | Hard | [Sort Items by Groups Respecting Dependencies](Problems/1203.cpp) |
| 1207 | Easy | [Unique Number of Occurrences](Problems/1207.cpp) |
@@ -650,6 +654,7 @@ for solving problems.
| 1381 | Medium | [Design a Stack With Increment Operation](Problems/1381.cpp) |
| 1382 | Medium | [Balance a Binary Search Tree](Problems/1382.cpp) |
| 1387 | Medium | [Sort Integers by The Power Value](Problems/1387.cpp) |
+| 1393 | Medium | [Capital Gain/Loss](Problems/1393.cpp) |
| 1395 | Medium | [Count Number of Teams](Problems/1395.cpp) |
| 1396 | Medium | [Design Underground System](Problems/1396.cpp) |
| 1400 | Medium | [Construct K Palindrome Strings](Problems/1400.cpp) |
@@ -822,6 +827,7 @@ for solving problems.
| 1921 | Medium | [Eliminate Maximum Number of Monsters](Problems/1921.cpp) |
| 1926 | Medium | [Nearest Exit from Entrance in Maze](Problems/1926.cpp) |
| 1930 | Medium | [Unique Length-3 Palindromic Subsequences](Problems/1930.cpp) |
+| 1934 | Medium | [Confirmation Rate](Problems/1934.cpp) |
| 1947 | Medium | [Maximum Compatibility Score Sum](Problems/1947.cpp) |
| 1962 | Medium | [Remove Stones to Minimize the Total](Problems/1962.cpp) |
| 1963 | Medium | [Minimum Number of Swaps to Make the String Balanced](Problems/1963.cpp) |
