show me how to use dynamic pivot in SQL, give an example and order it ,please
 Sure, I'd be happy to help you with that! Dynamic pivot in SQL is a powerful technique that allows you to create a pivot table from a result set whose columns may vary. Here's an example of how to use dynamic pivot in SQL:

Let's say we have a table called `sales_data` that contains the following columns: `region`, `product`, and `sales`. The data in the table looks like this:
```sql
region | product  | sales
-------+----------+-------
North  | Product1 | 100
North  | Product2 | 200
North  | Product3 | 150
South  | Product1 | 120
South  | Product2 | 220
South  | Product3 | 180
East   | Product1 | 150
East   | Product2 | 250
East   | Product3 | 200
West   | Product1 | 200
West   | Product2 | 300
West   | Product3 | 250
```
We want to create a pivot table that shows the total sales for each product by region. However, the number of products may vary, so we need to use a dynamic pivot.

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Dynamic Pivot is a SQL Server feature that allows you to summarize and analyze data by specifying a query expression instead of a static pivot table. For example, you can use Dynamic Pivot to summarize sales data by customer, product, or region. 

To use Dynamic Pivot in SQL, you first need to identify the rows that you want to summarize. Then, you use a CASE expression to generate a new column that contains the values for each level of the pivot. Finally, you use the GROUP BY and MAX/MIN functions to summarize the data for each level. 

For example, you can use Dynamic Pivot to summarize sales data by customer, product, or region. The following query demonstrates how to use Dynamic Pivot to summarize sales data by customer:

SELECT customer_name, SUM(sales)
FROM sales
GROUP BY customer_name

This query will generate a new column that contains the values for each level of the pivot. The following query demonstrates how to use this new column to summarize the data for each level:

SELECT customer_name, MAX(sales_by_product) AS sales_by_product, MAX(sales_by_region) AS sales_by_region
FROM (
  SELECT customer_name, sales_by_product, sales_by_region
  FROM (
    SELECT customer_name, CASE WHEN product = '