优化代码SELECT SUM(CASE WHEN order_date BETWEEN ‘2021-11-01’ AND ‘2021-11-15’ THEN 1 ELSE 0 END) AS new_customer_count, SUM(CASE WHEN order_date BETWEEN ‘2021-11-01’ AND ‘2021-11-15’ THEN amount ELSE 0 END) AS new_customer_amount, SUM(CASE WHEN order_date BETWEEN ‘2021-11-01’ AND ‘2021-11-15’ AND customer_id IN ( SELECT customer_id FROM orders WHERE order_date < ‘2020-11-01’ ) THEN 1 ELSE 0 END) AS old_customer_count, SUM(CASE WHEN order_date BETWEEN ‘2021-11-01’ AND ‘2021-11-15’ AND customer_id IN ( SELECT customer_id FROM orders WHERE order_date < ‘2020-11-01’ ) THEN amount ELSE 0 END) AS old_customer_amount FROM orders WHERE order_date BETWEEN ‘2021-11-01’ AND ‘2021-11-15’
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