如何在此数据库中获取总计

Question

我有一个数据库。

-----------------------
|   code   |  value  |
-----------------------
| shipping |  20     |
| unique   |   4     |
| shipping |  25     |
| unique   |   6     |
-----------------------

totals "shipping" = 45 (should)

我的意思是如何获得基于totals order_id的{​​{1}} code = " shipping "。我使用数据库opencart。谢谢。

Answer 1

tblFolding

Answer 2

您可以使用MySql的sum方法完成此操作。请尝试以下查询。

按您的唯一字段分组并将值相加。

SELECT code, sum(value) as total FORM table WHERE code = 'shipping' GROUP BY order_id

Answer 3

 SELECT
  code,
       SUM(value) AS value
FROM
    order_table
WHERE code="shipping" GROUP BY code

Answer 4

您应该能够使用sum和group by来获取每个代码的成本。

试试这个

SELECT code, sum(value) as total FORM table WHERE code = 'shipping' GROUP BY code