mysql中的having语句
MySQL中的HAVING语句用于在GROUP BY子句之后对分组结果进行筛选和过滤。它可以使用聚合函数对分组结果进行条件判断，并返回满足条件的分组结果。以下是关于HAVING语句的一些例子：
1. 返回销售额大于1000的订单数量：
```sql
SELECT COUNT(*) AS order_count
FROM orders
GROUP BY customer_id
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HAVING SUM(total_amount) > 1000;
```
2. 返回订单中购买商品数量大于5的顾客信息：
```sql
SELECT customer_id, COUNT(*) AS order_count
FROM orders
GROUP BY customer_id
HAVING COUNT(*) > 5;
```
3. 返回每个年龄段购买商品数量超过10的顾客信息：
mysql语句分类```sql
SELECT age, COUNT(*) AS order_count
FROM customers
GROUP BY age
HAVING COUNT(*) > 10;
```
4. 返回每个部门中工资平均值大于5000的员工信息：
```sql
SELECT department_id, AVG(salary) AS avg_salary
FROM employees
GROUP BY department_id
HAVING AVG(salary) > 5000;
```
5. 返回购买商品数量最多的顾客信息：
```sql
SELECT customer_id, COUNT(*) AS order_count
FROM orders
GROUP BY customer_idwarm的中文
HAVING COUNT(*) = (
js语言和java的区别    SELECT MAX(order_count)
    FROM (
        SELECT COUNT(*) AS order_count
        FROM orders
        GROUP BY customer_id
    ) AS subquery
);
```
6. 返回购买商品数量最少的顾客信息：
```sql
SELECT customer_id, COUNT(*) AS order_count
FROM orders
GROUP BY customer_id
HAVING COUNT(*) = (
    SELECT MIN(order_count)
    FROM (
        SELECT COUNT(*) AS order_count
        FROM orders
        GROUP BY customer_id
    ) AS subquery
);
```
7. 返回购买商品总金额最多的顾客信息：
```sql
SELECT customer_id, SUM(total_amount) AS total_amount
FROM orders
GROUP BY customer_id
HAVING SUM(total_amount) = (
    SELECT MAX(total_amount)
    FROM (
        SELECT SUM(total_amount) AS total_amount
        FROM orders
        GROUP BY customer_id
    ) AS subquery
);
```
8. 返回购买商品总金额最少的顾客信息：
```sql
SELECT customer_id, SUM(total_amount) AS total_amount
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GROUP BY customer_id
header是页眉吗HAVING SUM(total_amount) = (
    SELECT MIN(total_amount)
    FROM (

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