[英]How to sum each unique last value from table
I want to SUM the total amount of KG of each unique last value in a table.我想对表中每个唯一最后一个值的 KG 总量求和。
The table i currently have looks like this我目前的桌子看起来像这样
|----|-----------|----------|----------|----------|---------------|
| id | productId | amountKg | amountSt | location | datetimeStamp |
|----|-----------|----------|----------|----------|---------------|
| 12 | 19 | 201 | 0 | loc1 | 2019-12-21 |
| 13 | 19 | 35 | 0 | loc2 | 2019-12-22 | <---
| 14 | 19 | 400 | 0 | loc1 | 2019-12-23 | <---
|----|-----------|----------|----------|----------|---------------|
And I have this SQL query我有这个 SQL 查询
SELECT SUM(amountKg) FROM (SELECT amountKg FROM storage GROUP BY location ORDER BY id ASC) t;
Whe I run this query I get the result 236 The result I want is 435, the sum of the 14 and 13 (The arrows in the table)当我运行这个查询时,我得到了结果 236 我想要的结果是 435,14 和 13 的总和(表中的箭头)
Any help is appreciated任何帮助表示赞赏
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