The meaning of any in mysql

<blockquote><p>The ANY operator checks whether at least one row in a MySQL table meets a specified condition, as opposed to the ALL operator which requires all rows to meet the condition. Its uses include: checking at least one row for matching conditions, comparing results with subqueries, and nested subqueries. ANY is generally more performant than the ALL operator. </p></blockquote> <p><img src="https://img.php.cn/upload/article/202404/27/2024042703511540764.jpg" alt="The meaning of any in mysql" ></p> <p><strong>Meaning of ANY in MySQL</strong></p> <p>In MySQL, the ANY operator is used to check the Whether any row meets the specified conditions. It is the opposite of the ALL operator, which requires all rows in the table to satisfy the condition. </p> <p><strong>Syntax</strong></p> <p><code>ANY</code> The syntax of the operator is as follows: </p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="sql">SELECT column_name FROM table_name WHERE condition ANY (subquery);</code></pre><div class="contentsignin">Copy after login</div></div> <p><strong>Usage</strong></p> <p><code>ANY</code> operator is used in the following scenarios: </p> <ul><li> <strong>Checking at least one row matching a condition: </strong>When you just want to ensure that at least one row in the table meets a specific condition hour. For example: </li></ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="sql">SELECT customer_name FROM customers WHERE age ANY (18, 21, 25);</code></pre><div class="contentsignin">Copy after login</div></div> <ul><li> <strong>Compare with the results of the subquery: </strong>You can use the <code>ANY</code> operator to compare the values ​​in the table with the results of the subquery Compare. For example: </li></ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="sql">SELECT product_id FROM products WHERE price ANY (SELECT price FROM orders);</code></pre><div class="contentsignin">Copy after login</div></div> <ul><li> <strong>Nested subquery: </strong><code>ANY</code> Operators can be nested within subqueries to create more complex queries. For example: </li></ul> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="sql">SELECT customer_name FROM customers WHERE age ANY ( SELECT age FROM customers WHERE city = 'New York' );</code></pre><div class="contentsignin">Copy after login</div></div> <p><strong>Note</strong></p> <ul> <li> <code>ANY</code> operator only applies to comparison operators, such as <code>= </code>, <code>></code> and <code><</code>. </li> <li>The <code>ANY</code> operator is generally more performant than the <code>ALL</code> operator because it only needs to check one row in the table. </li> <li>If the subquery returns an empty result set, the <code>ANY</code> operator will return <code>NULL</code>. </li> </ul>

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