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77 lines
2.4 KiB
HTML
77 lines
2.4 KiB
HTML
<p>Table: <code>Users</code></p>
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<pre>
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+--------------+---------+
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| Column Name | Type |
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+--------------+---------+
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| account | int |
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| name | varchar |
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+--------------+---------+
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account is the primary key for this table.
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Each row of this table contains the account number of each user in the bank.
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</pre>
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<p> </p>
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<p>Table: <code>Transactions</code></p>
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<pre>
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+---------------+---------+
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| Column Name | Type |
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+---------------+---------+
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| trans_id | int |
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| account | int |
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| amount | int |
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| transacted_on | date |
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+---------------+---------+
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trans_id is the primary key for this table.
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Each row of this table contains all changes made to all accounts.
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amount is positive if the user received money and negative if they transferred money.
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All accounts start with a balance of 0.
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</pre>
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<p> </p>
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<p>Write an SQL query to report the name and balance of users with a balance higher than <code>10000</code>. The balance of an account is equal to the sum of the amounts of all transactions involving that account.</p>
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<p>Return the result table in <strong>any order</strong>.</p>
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<p>The query result format is in the following example.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Users table:
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+------------+--------------+
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| account | name |
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+------------+--------------+
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| 900001 | Alice |
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| 900002 | Bob |
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| 900003 | Charlie |
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+------------+--------------+
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Transactions table:
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+------------+------------+------------+---------------+
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| trans_id | account | amount | transacted_on |
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+------------+------------+------------+---------------+
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| 1 | 900001 | 7000 | 2020-08-01 |
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| 2 | 900001 | 7000 | 2020-09-01 |
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| 3 | 900001 | -3000 | 2020-09-02 |
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| 4 | 900002 | 1000 | 2020-09-12 |
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| 5 | 900003 | 6000 | 2020-08-07 |
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| 6 | 900003 | 6000 | 2020-09-07 |
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| 7 | 900003 | -4000 | 2020-09-11 |
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+------------+------------+------------+---------------+
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<strong>Output:</strong>
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+------------+------------+
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| name | balance |
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+------------+------------+
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| Alice | 11000 |
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+------------+------------+
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<strong>Explanation:</strong>
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Alice's balance is (7000 + 7000 - 3000) = 11000.
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Bob's balance is 1000.
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Charlie's balance is (6000 + 6000 - 4000) = 8000.
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</pre>
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