I know the usage of count and group by like "SELECT customer_id, COUNT(product_type) as sales_count FROM sales GROUP BY customer_id, product_type";
My question is: The value of product_type must be 1, 2, 3 or 4, can I use one sql to get count of each type?
I want result like:
customer_id type_1 type_2 type_3 type_4
1001 2 1 1 0
1002 3 0 4 1
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