Question

我必须生成2个报告：＆＃34;按类别划分的费用＆＃34;和＆＃34;按子类别划分的费用＆＃34;。由于我的银行结构如下：

CREATE TABLE `category` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `parent_id` int(11) DEFAULT NULL,
 `desc_category` varchar(255) NOT NULL,
 `user_id` int(11) NOT NULL DEFAULT '1',
 `created` datetime NOT NULL,
 PRIMARY KEY (`id`),
 KEY `id` (`id`)
) 

/----------------------------------------------------\
| id | parent_id | desc_category   |user_id| created |
|----|-----------|-----------------|-------|---------|
| 1  | NULL      | Residence       | 9     | ...     |
| 2  | 1         | Rent            | 9     | ...     |
| 3  | 1         | maintenance     | 9     | ...     |
| 4  | NULL      | Person          | 9     | ...     |
| 5  | 4         | Alimentation    | 9     | ...     |
| 6  | 4         | school          | 9     | ...     |
\----------------------------------------------------/

报告＆＃34;按子类别划分的费用＆＃34;这样做了：

SELECT desc_category AS cat, value FROM cashbook
            INNER JOIN category
            ON cashbook.category_id = category.id_category
            WHERE category.user_id = $user AND type_id = 2 AND MONTH(date) = $thismonth AND YEAR(date) = $thisyear

我如何按类别支出？（例如居住和人）

领取where parent_id is NULL？

在表上搜索递归结构

0 个答案: