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49 lines
1.9 KiB
HTML
49 lines
1.9 KiB
HTML
<p>表：<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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| id | int |
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| country | varchar |
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| state | enum |
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| amount | int |
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| trans_date | date |
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+---------------+---------+
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id 是这个表的主键。
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该表包含有关传入事务的信息。
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state 列类型为 ["approved", "declined"] 之一。
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</pre>
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<p> </p>
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<p>编写一个 sql 查询来查找每个月和每个国家/地区的事务数及其总金额、已批准的事务数及其总金额。</p>
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<p>以 <strong>任意顺序</strong> 返回结果表。</p>
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<p>查询结果格式如下所示。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<code><strong>输入：</strong>
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Transactions</code> table:
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+------+---------+----------+--------+------------+
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| id | country | state | amount | trans_date |
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+------+---------+----------+--------+------------+
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| 121 | US | approved | 1000 | 2018-12-18 |
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| 122 | US | declined | 2000 | 2018-12-19 |
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| 123 | US | approved | 2000 | 2019-01-01 |
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| 124 | DE | approved | 2000 | 2019-01-07 |
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+------+---------+----------+--------+------------+
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<strong>输出：</strong>
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+----------+---------+-------------+----------------+--------------------+-----------------------+
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| month | country | trans_count | approved_count | trans_total_amount | approved_total_amount |
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+----------+---------+-------------+----------------+--------------------+-----------------------+
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| 2018-12 | US | 2 | 1 | 3000 | 1000 |
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| 2019-01 | US | 1 | 1 | 2000 | 2000 |
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| 2019-01 | DE | 1 | 1 | 2000 | 2000 |
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+----------+---------+-------------+----------------+--------------------+-----------------------+</pre>
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