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51 lines
1.8 KiB
HTML
51 lines
1.8 KiB
HTML
<p>Table: <code>Products</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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| product_id | int |
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| store1 | int |
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| store2 | int |
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| store3 | int |
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+-------------+---------+
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product_id is the primary key for this table.
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Each row in this table indicates the product's price in 3 different stores: store1, store2, and store3.
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If the product is not available in a store, the price will be null in that store's column.
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</pre>
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<p> </p>
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<p>Write an SQL query to rearrange the <code>Products</code> table so that each row has <code>(product_id, store, price)</code>. If a product is not available in a store, do <strong>not</strong> include a row with that <code>product_id</code> and <code>store</code> combination in the result table.</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>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Products table:
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+------------+--------+--------+--------+
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| product_id | store1 | store2 | store3 |
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+------------+--------+--------+--------+
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| 0 | 95 | 100 | 105 |
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| 1 | 70 | null | 80 |
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+------------+--------+--------+--------+
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<strong>Output:</strong>
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+------------+--------+-------+
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| product_id | store | price |
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+------------+--------+-------+
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| 0 | store1 | 95 |
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| 0 | store2 | 100 |
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| 0 | store3 | 105 |
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| 1 | store1 | 70 |
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| 1 | store3 | 80 |
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+------------+--------+-------+
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<strong>Explanation:</strong>
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Product 0 is available in all three stores with prices 95, 100, and 105 respectively.
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Product 1 is available in store1 with price 70 and store3 with price 80. The product is not available in store2.
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</pre>
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