国外版

算法题（国外版）/recyclable-and-low-fat-products.html

@@ -0,0 +1,46 @@
+<p>Table: <code>Products</code></p>
+
+<pre>
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| product_id  | int     |
+| low_fats    | enum    |
+| recyclable  | enum    |
++-------------+---------+
+product_id is the primary key for this table.
+low_fats is an ENUM of type (&#39;Y&#39;, &#39;N&#39;) where &#39;Y&#39; means this product is low fat and &#39;N&#39; means it is not.
+recyclable is an ENUM of types (&#39;Y&#39;, &#39;N&#39;) where &#39;Y&#39; means this product is recyclable and &#39;N&#39; means it is not.</pre>
+
+<p>&nbsp;</p>
+
+<p>Write an SQL query to find the ids of products that are both low fat and recyclable.</p>
+
+<p>Return the result table in <strong>any order</strong>.</p>
+
+<p>The query result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+Products table:
++-------------+----------+------------+
+| product_id  | low_fats | recyclable |
++-------------+----------+------------+
+| 0           | Y        | N          |
+| 1           | Y        | Y          |
+| 2           | N        | Y          |
+| 3           | Y        | Y          |
+| 4           | N        | N          |
++-------------+----------+------------+
+<strong>Output:</strong> 
++-------------+
+| product_id  |
++-------------+
+| 1           |
+| 3           |
++-------------+
+<strong>Explanation:</strong> Only products 1 and 3 are both low fat and recyclable.
+</pre>