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Mysql 数据库设计结构
原标题:Mysql Database design structure
Which is a better db design when inserting records? **Option 1.** uid|itemid| qty | price | amount 1 |13| 2 | 100 |200 **Option 2.** uid| itemid| qty | price | amount 1 |13| 1 | 100 | 100 2 |13| 1 | 100 | 100 In option 2 then retrieve rows via mysql query and calculate using id ...
最佳回答
It seems like you want to retain the original price of each item ordered. What I d do is go with option 1, then create another column in your table that holds a string that identifies each item in the order. For example, if I were selling fruit, a banana could have iZ as a unique key. And an apple could have 6U as a unique key. When a user places an order, these unique keys would be inserted into your new column. So when you see this column s data is iZ6U you d know that the user ordered an apple and a banana.
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