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51 lines
1.2 KiB
HTML
51 lines
1.2 KiB
HTML
<p>Table: <code>Seat</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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| name | varchar |
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+-------------+---------+
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id is the primary key column for this table.
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Each row of this table indicates the name and the ID of a student.
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id is a continuous increment.
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</pre>
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<p> </p>
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<p>Write an SQL query to swap the seat id of every two consecutive students. If the number of students is odd, the id of the last student is not swapped.</p>
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<p>Return the result table ordered by <code>id</code> <strong>in ascending 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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Seat table:
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+----+---------+
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| id | student |
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+----+---------+
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| 1 | Abbot |
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| 2 | Doris |
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| 3 | Emerson |
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| 4 | Green |
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| 5 | Jeames |
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+----+---------+
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<strong>Output:</strong>
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+----+---------+
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| id | student |
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+----+---------+
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| 1 | Doris |
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| 2 | Abbot |
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| 3 | Green |
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| 4 | Emerson |
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| 5 | Jeames |
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+----+---------+
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<strong>Explanation:</strong>
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Note that if the number of students is odd, there is no need to change the last one's seat.
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</pre>
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