MySql

Question

如何从MySQL中获取平均值的最大值？以下查询返回按客户分组的表格订单的金额平均值。

SELECT AVG(amount)
FROM orders
GROUP BY cust;

我希望使用带有聚合函数的单个查询从平均值中获取最大值。使用ORDER BY ... DESC LIMIT 1肯定有效，但我感兴趣的是仅使用聚合函数获得最大平均值。有可能吗？感谢

Answer 1

    <ul class="ch-grid">
        <li>
            <div class="ch-item ch-img-1">
                <div class="ch-info">
                    <h3>Games</h3>
                    <p>
                        by Bill Hicks <a href="http://www.iristimes.com">Quickly! go there now</a>
                    </p>
                </div>
            </div>
        </li>
        <li>
            <div class="ch-item ch-img-2">
                <div class="ch-info">
                    <h3>Illustration</h3>
                    <p>
                        by Steven Wright <a href="http://www.independent.ie ">Captain Semantics</a>
                    </p>
                </div>
            </div>
        </li>
        <li>
            <div class="ch-item ch-img-3">
                <div class="ch-info">
                    <h3>Characters</h3>
                    <p>
                        by Johnny Vegas <a href="http://www.examiner.ie ">Lovable Mentalist</a>
                    </p>
                </div>
            </div>
        </li>
        <li>
            <div class="ch-item ch-img-4">
                <div class="ch-info">
                    <h3>Modelling</h3>
                    <p>
                        by Benedict Cumberbatch <a href="http://www.dribbble.com">Smartypants Himself</a>
                    </p>
                </div>
            </div>
        </li>
    </ul>

Answer 2

我会使用order by和limit执行此操作：

SELECT AVG(o.amount) as avg_value
FROM orders o
GROUP BY cust
ORDER BY avg_value DESC
LIMIT 1;

这样您也可以获得最大值cust。