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70 lines
2.2 KiB
HTML
70 lines
2.2 KiB
HTML
<p>表: <code>Person</code></p>
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<pre>
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+-------------+---------+
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| 列名 | 类型 |
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+-------------+---------+
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| PersonId | int |
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| FirstName | varchar |
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| LastName | varchar |
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+-------------+---------+
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personId是该表的主键列。
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该表包含一些人的ID和他们的姓和名的信息。
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</pre>
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<p> </p>
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<p>表: <code>Address</code></p>
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<pre>
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+-------------+---------+
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| 列名 | 类型 |
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+-------------+---------+
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| AddressId | int |
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| PersonId | int |
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| City | varchar |
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| State | varchar |
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+-------------+---------+
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addressId是该表的主键列。
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该表的每一行都包含一个ID = PersonId的人的城市和州的信息。
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</pre>
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<p> </p>
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<p>编写一个SQL查询来报告 <code>Person</code> 表中每个人的姓、名、城市和状态。如果 <code>personId</code> 的地址不在 <code>Address</code> 表中，则报告为空 <code>null</code> 。</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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<strong>输入:</strong>
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Person表:
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+----------+----------+-----------+
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| personId | lastName | firstName |
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+----------+----------+-----------+
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| 1 | Wang | Allen |
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| 2 | Alice | Bob |
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+----------+----------+-----------+
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Address表:
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+-----------+----------+---------------+------------+
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| addressId | personId | city | state |
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+-----------+----------+---------------+------------+
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| 1 | 2 | New York City | New York |
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| 2 | 3 | Leetcode | California |
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+-----------+----------+---------------+------------+
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<strong>输出:</strong>
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+-----------+----------+---------------+----------+
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| firstName | lastName | city | state |
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+-----------+----------+---------------+----------+
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| Allen | Wang | Null | Null |
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| Bob | Alice | New York City | New York |
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+-----------+----------+---------------+----------+
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<strong>解释:</strong>
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地址表中没有 personId = 1 的地址，所以它们的城市和州返回null。
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addressId = 1 包含了 personId = 2 的地址信息。</pre>
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