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73 lines
2.2 KiB
HTML
73 lines
2.2 KiB
HTML
<p>表: <code>Users</code></p>
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<pre>+--------------+---------+
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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 是该表的主键.
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表中的每一行包含银行里中每一个用户的账号.
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</pre>
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<p> </p>
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<p>表: <code>Transactions</code></p>
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<pre>+---------------+---------+
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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 是该表主键.
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该表的每一行包含了所有账户的交易改变情况.
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如果用户收到了钱, 那么金额是正的; 如果用户转了钱, 那么金额是负的.
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所有账户的起始余额为 0.
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</pre>
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<p> </p>
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<p>写一个 SQL, 报告余额高于 10000 的所有用户的名字和余额. 账户的余额等于包含该账户的所有交易的总和.</p>
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<p>返回结果表单没有顺序要求.</p>
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<p>查询结果格式如下例所示.</p>
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<p> </p>
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<pre><code>Users</code> 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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<code>Transactions</code> 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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Result table:
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+------------+------------+
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| <code>name </code> | <code>balance </code> |
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+------------+------------+
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| Alice | 11000 |
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+------------+------------+
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Alice 的余额为(7000 + 7000 - 3000) = 11000.
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Bob 的余额为1000.
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Charlie 的余额为(6000 + 6000 - 4000) = 8000.
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</pre>
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