group by having
时间: 2023-08-25 22:07:55 浏览: 24
The GROUP BY clause is used in SQL to group together rows that have the same values in one or more columns. The HAVING clause is used in conjunction with GROUP BY to filter the grouped results based on a condition.
For example, let's say we have a table called "sales" with columns for "region", "product", and "sales_amount". We can use GROUP BY to group the sales by region and product, and then use HAVING to only show the results where the total sales for that region and product exceed a certain threshold:
```
SELECT region, product, SUM(sales_amount) as total_sales
FROM sales
GROUP BY region, product
HAVING total_sales > 10000
```
This query will group the sales by region and product, calculate the total sales for each group, and then only show the results where the total sales are greater than 10000.
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