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50 lines
1.8 KiB
HTML
50 lines
1.8 KiB
HTML
<p>Table: <code>Department</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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| revenue | int |
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| month | varchar |
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+-------------+---------+
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In SQL,(id, month) is the primary key of this table.
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The table has information about the revenue of each department per month.
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The month has values in ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"].
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</pre>
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<p> </p>
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<p>Reformat the table such that there is a department id column and a revenue column <strong>for each month</strong>.</p>
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<p>Return the result table in <strong>any order</strong>.</p>
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<p>The 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>
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<strong>Input:</strong>
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Department table:
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+------+---------+-------+
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| id | revenue | month |
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+------+---------+-------+
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| 1 | 8000 | Jan |
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| 2 | 9000 | Jan |
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| 3 | 10000 | Feb |
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| 1 | 7000 | Feb |
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| 1 | 6000 | Mar |
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+------+---------+-------+
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<strong>Output:</strong>
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+------+-------------+-------------+-------------+-----+-------------+
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| id | Jan_Revenue | Feb_Revenue | Mar_Revenue | ... | Dec_Revenue |
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+------+-------------+-------------+-------------+-----+-------------+
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| 1 | 8000 | 7000 | 6000 | ... | null |
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| 2 | 9000 | null | null | ... | null |
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| 3 | null | 10000 | null | ... | null |
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+------+-------------+-------------+-------------+-----+-------------+
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<strong>Explanation:</strong> The revenue from Apr to Dec is null.
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Note that the result table has 13 columns (1 for the department id + 12 for the months).
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</pre>
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