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                ## 3.6 常見查詢示例 下面使如何用 MySQL 解決一些常見問題的示例. 一些示例表使用 shop 表為特定的貿易商(經銷商)保存每個商品(商品編號)的價格. 假設每個商人的每件物品都有一個固定的價格, 然后 (`article`, `dealer`) 使每條記錄的主鍵. 啟動命令行工具 [mysql](https://dev.mysql.com/doc/refman/8.0/en/mysql.html) 并選擇一個數據庫: ```bash shell> mysql your-database-name ``` 創建和填充示例表, 使用以下語句: ```sql CREATE TABLE shop ( article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL, dealer CHAR(20) DEFAULT '' NOT NULL, price DOUBLE(16,2) DEFAULT '0.00' NOT NULL, PRIMARY KEY(article, dealer)); INSERT INTO shop VALUES (1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45), (3,'C',1.69),(3,'D',1.25),(4,'D',19.95); ``` 在執行以下語句后, 表應該顯示如下內容: ```bash SELECT * FROM shop ORDER BY article; +---------+--------+-------+ | article | dealer | price | +---------+--------+-------+ | 0001 | A | 3.45 | | 0001 | B | 3.99 | | 0002 | A | 10.99 | | 0003 | B | 1.45 | | 0003 | C | 1.69 | | 0003 | D | 1.25 | | 0004 | D | 19.95 | +---------+--------+-------+ ```
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