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Deven
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67 lines
2.7 KiB
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<h2><a href="https://leetcode.com/problems/combine-two-tables/">175. Combine Two Tables</a></h2><h3>Easy</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><p>Table: <code>Person</code></p>
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<pre>+-------------+---------+
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| Column Name | Type |
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+-------------+---------+
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| personId | int |
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| lastName | varchar |
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| firstName | varchar |
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+-------------+---------+
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personId is the primary key column for this table.
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This table contains information about the ID of some persons and their first and last names.
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</pre>
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<p> </p>
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<p>Table: <code>Address</code></p>
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<pre>+-------------+---------+
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| Column Name | Type |
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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 is the primary key column for this table.
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Each row of this table contains information about the city and state of one person with ID = PersonId.
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</pre>
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<p> </p>
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<p>Write an SQL query to report the first name, last name, city, and state of each person in the <code>Person</code> table. If the address of a <code>personId</code> is not present in the <code>Address</code> table, report <code>null</code> instead.</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 class="example">Example 1:</strong></p>
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<pre><strong>Input:</strong>
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Person table:
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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 table:
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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>Output:</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>Explanation:</strong>
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There is no address in the address table for the personId = 1 so we return null in their city and state.
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addressId = 1 contains information about the address of personId = 2.
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</pre>
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</div> |