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leetcode-problemset/leetcode-cn/problem (Chinese)/可回收且低脂的产品 [recyclable-and-low-fat-products].html
2022-03-29 12:43:11 +08:00

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<p>表:<code>Products</code></p>
<pre>
+-------------+---------+
| Column Name | Type |
+-------------+---------+
| product_id | int |
| low_fats | enum |
| recyclable | enum |
+-------------+---------+
product_id 是这个表的主键。
low_fats 是枚举类型,取值为以下两种 ('Y', 'N'),其中 'Y' 表示该产品是低脂产品,'N' 表示不是低脂产品。
recyclable 是枚举类型,取值为以下两种 ('Y', 'N'),其中 'Y' 表示该产品可回收,而 'N' 表示不可回收。</pre>
<p> </p>
<p>写出 SQL 语句,查找既是低脂又是可回收的产品编号。</p>
<p>返回结果 <strong>无顺序要求</strong></p>
<p>查询结果格式如下例所示:</p>
<pre>
Products 表:
+-------------+----------+------------+
| product_id | low_fats | recyclable |
+-------------+----------+------------+
| 0 | Y | N |
| 1 | Y | Y |
| 2 | N | Y |
| 3 | Y | Y |
| 4 | N | N |
+-------------+----------+------------+
Result 表:
+-------------+
| product_id |
+-------------+
| 1 |
| 3 |
+-------------+
只有产品 id 为 1 和 3 的产品,既是低脂又是可回收的产品。
</pre>