如何分隔记录以获取金额

Question

我总共有 160 个库存。

如何获取前100个总量和后60个总量？

表格按日期和股票 ID 排序。

tblStock
+----------+------------+----------+----------+------------+
+ Stock ID + Product ID + Quantity + Amount   + Date       +
+----------+------------+----------+----------+------------+
+        1 +       1001 +       50 +    10.00 + 2014-11-10 +
+----------+------------+----------+----------+------------+
+        2 +       1001 +       70 +    11.00 + 2014-11-11 +
+----------+------------+----------+----------+------------+
+        3 +       1001 +       30 +     9.90 + 2014-11-12 +
+----------+------------+----------+----------+------------+
+        4 +       1001 +       10 +    10.20 + 2014-11-13 +
+----------+------------+----------+----------+------------+

我需要下面的两个结果。谢谢

Result A (first 100 quantity)
+------------+----------+--------------+
+ Product ID + Quantity + Total Amount +
+------------+----------+--------------+
+       1001 +      100 +      1050.00 +
+------------+----------+--------------+

Result B (last 60 quantity)
+------------+----------+--------------+
+ Product ID + Quantity + Total Amount +
+------------+----------+--------------+
+       1001 +       60 +       619.00 +
+------------+----------+--------------+

Answer 1

前 100 名

选择Product ID, sum(Quantity) 作为Quantity, sum(Amount) 作为TotalAmount from (SELECT * from tblstock order by tblStock.Stock ID ASC 限制 100) t1 GROUP BY Date,Product ID

最后 60 个

select Product ID, sum(Quantity) as Quantity, sum(Amount) as Total Amount from (SELECT * from tblstock order by tblStock.Stock ID DESC 限制 60) t1 GROUP BY Date,Product ID

Answer 2

试试这个：

结果 A：

SELECT A.ProductID AS 'Product ID', '100' AS 'Quantity', SUM(A.Amount) as 'Total Amount'
FROM tblStock A
WHERE StockID IN (SELECT B.StockID from tblStock B ORDER BY B.StockID ASC LIMIT 100)

结果 B：

SELECT A.ProductID AS 'Product ID', '60' AS 'Quantity', SUM(A.Amount) as 'Total Amount'
FROM tblStock A
WHERE StockID IN (SELECT B.StockID from tblStock B ORDER BY B.StockID DESC LIMIT 60)

您可以使用 JOIN，而不是使用 IN。

结果 A：

SELECT A.ProductID AS 'Product ID', '100' AS 'Quantity', SUM(A.Amount) AS 'Total Amount'
FROM tblStock AS A
INNER JOIN
 (SELECT StockID from tblStock ORDER BY StockID ASC LIMIT 100) AS B
ON A.StockID = B.StockID

结果 B：

SELECT A.ProductID AS 'Product ID', '60' AS 'Quantity', SUM(A.Amount) AS 'Total Amount'
FROM tblStock AS A
INNER JOIN
 (SELECT StockID from tblStock ORDER BY StockID DESC LIMIT 60) AS B
ON A.StockID = B.StockID