تعمل النافذة مع "نافذة" أو كيفية استخدام إطار

Create table sales 
(sales_id INT PRIMARY KEY, sales_dt DATETIME2 DEFAULT GETUTCDATE(),  customer_id INT, item_id INT, cnt INT, price_per_item DECIMAL(19,4));

INSERT INTO sales
(sales_id, sales_dt, customer_id, item_id, cnt, price_per_item)
VALUES
(1, '2020-01-10T10:00:00', 100, 200, 2, 30.15),
(2, '2020-01-11T11:00:00', 100, 311, 1, 5.00),
(3, '2020-01-12T14:00:00', 100, 400, 1, 50.00),
(4, '2020-01-12T20:00:00', 100, 311, 5, 5.00),
(5, '2020-01-13T10:00:00', 150, 311, 1, 5.00),
(6, '2020-01-13T11:00:00', 100, 315, 1, 17.00),
(7, '2020-01-14T10:00:00', 150, 200, 2, 30.15),
(8, '2020-01-14T15:00:00', 100, 380, 1, 8.00),
(9, '2020-01-14T18:00:00', 170, 380, 3, 8.00),
(10, '2020-01-15T09:30:00', 100, 311, 1, 5.00),
(11, '2020-01-15T12:45:00', 150, 311, 5, 5.00),
(12, '2020-01-15T21:30:00', 170, 200, 1, 30.15);

SELECT sales_id, customer_id, count, 
SUM(count) OVER () as total,
SUM(count) OVER (ORDER BY customer_id) AS cum,
SUM(count) OVER (ORDER BY customer_id, sales_id) AS cum_uniq
FROM sales
ORDER BY customer_id, sales_id;

1. كل شيء قبل الصف / النطاق الحالي والقيمة الفعلية للصف الحالي
   بين سابقة غير مسبوقة
   بين سابقة غير مقيدة وحالية
   
2. الصف / النطاق الحالي وكل شيء بعد ذلك
   بين الصفوف الحالية والمتابعة غير المقيدة
3. تحديد عدد الأسطر قبل وبعد تضمين (غير مدعوم لـ RANGE)
   بين N و N التالية
   بين ROWWEN الحاليين و N التالية
   بين N السابقة والسابقة ROW
   

SELECT sales_id, customer_id, cnt, 
SUM(cnt) OVER (ORDER BY customer_id, sales_id) AS cum_uniq,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS UNBOUNDED PRECEDING) AS current_and_all_before,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS current_and_all_before2
FROM sales
ORDER BY customer_id, sales_id;

SELECT sales_id, customer_id, cnt, 
SUM(cnt) OVER (ORDER BY customer_id, sales_id) AS cum_uniq,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS UNBOUNDED PRECEDING) AS current_and_all_before,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS current_and_all_before2
FROM sales
ORDER BY cnt;

SELECT sales_id, customer_id, cnt, 
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS current_and_all_frame,
SUM(cnt) OVER (ORDER BY customer_id DESC, sales_id DESC) AS current_and_all_order_desc
FROM sales
ORDER BY customer_id, sales_id;

SELECT sales_id, customer_id, cnt, 
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) AS before_and_current,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN CURRENT ROW AND 1 FOLLOWING) AS current_and_1_next,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, sales_id ROWS BETWEEN 2 PRECEDING AND 2 FOLLOWING) AS before2_and_2_next
FROM sales
ORDER BY customer_id, sales_id;

الفرق بين ROWS و RANGE

SELECT sales_id, customer_id, cnt, 
SUM(cnt) OVER (ORDER BY customer_id) AS cum_uniq,
cnt,
SUM(cnt) OVER (ORDER BY customer_id ROWS UNBOUNDED PRECEDING) AS current_and_all_before,
customer_id,
cnt,
SUM(cnt) OVER (ORDER BY customer_id RANGE UNBOUNDED PRECEDING) AS current_and_all_before2
FROM sales
ORDER BY 2, sales_id;

SELECT sales_id, customer_id, price_per_item, cnt, 
SUM(cnt) OVER (ORDER BY customer_id, price_per_item) AS cum_uniq,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, price_per_item ROWS UNBOUNDED PRECEDING) AS current_and_all_before,
customer_id,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, price_per_item RANGE UNBOUNDED PRECEDING) AS current_and_all_before2
FROM sales
ORDER BY 2, price_per_item;

SELECT sales_id, customer_id, price_per_item, cnt, 
SUM(cnt) OVER (ORDER BY customer_id DESC, price_per_item DESC) AS cum_uniq,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, price_per_item ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS current_and_all_before,
customer_id,
cnt,
SUM(cnt) OVER (ORDER BY customer_id, price_per_item RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS current_and_all_before2
FROM sales
ORDER BY 2, price_per_item, sales_id desc;