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Java Solution for LeetCode algorithm problems, continually updating
1393\. Capital Gain/Loss
Medium
SQL Schema
Table: `Stocks`
+---------------+---------+
| Column Name | Type |
+---------------+---------+
| stock_name | varchar |
| operation | enum |
| operation_day | int |
| price | int |
+---------------+---------+
(stock_name, operation_day) is the primary key for this table.
The operation column is an ENUM of type ('Sell', 'Buy')
Each row of this table indicates that the stock which has stock_name had an operation on the day operation_day with the price.
It is guaranteed that each 'Sell' operation for a stock has a corresponding 'Buy' operation in a previous day.
It is also guaranteed that each 'Buy' operation for a stock has a corresponding 'Sell' operation in an upcoming day.
Write an SQL query to report the **Capital gain/loss** for each stock.
The **Capital gain/loss** of a stock is the total gain or loss after buying and selling the stock one or many times.
Return the result table in **any order**.
The query result format is in the following example.
**Example 1:**
**Input:**
Stocks table:
+---------------+-----------+---------------+--------+
| stock_name | operation | operation_day | price |
+---------------+-----------+---------------+--------+
| Leetcode | Buy | 1 | 1000 |
| Corona Masks | Buy | 2 | 10 |
| Leetcode | Sell | 5 | 9000 |
| Handbags | Buy | 17 | 30000 |
| Corona Masks | Sell | 3 | 1010 |
| Corona Masks | Buy | 4 | 1000 |
| Corona Masks | Sell | 5 | 500 |
| Corona Masks | Buy | 6 | 1000 |
| Handbags | Sell | 29 | 7000 |
| Corona Masks | Sell | 10 | 10000 |
+---------------+-----------+---------------+--------+
**Output:**
+---------------+-------------------+
| stock_name | capital_gain_loss |
+---------------+-------------------+
| Corona Masks | 9500 |
| Leetcode | 8000 |
| Handbags | -23000 |
+---------------+-------------------+
**Explanation:**
Leetcode stock was bought at day 1 for 1000$ and was sold at day 5 for 9000$. Capital gain = 9000 - 1000 = 8000$.
Handbags stock was bought at day 17 for 30000$ and was sold at day 29 for 7000$. Capital loss = 7000 - 30000 = -23000$.
Corona Masks stock was bought at day 1 for 10$ and was sold at day 3 for 1010$. It was bought again at day 4 for 1000$ and was sold at day 5 for 500$.
At last, it was bought at day 6 for 1000$ and was sold at day 10 for 10000$.
Capital gain/loss is the sum of capital gains/losses for each ('Buy' --> 'Sell') operation = (1010 - 10) + (500 - 1000) + (10000 - 1000) = 1000 - 500 + 9000 = 9500$.