2
以下是我在github.com/rethinkdb問題上已經回答的問題。 我張貼這裏rethinkdb造福社會如何找出最近或最近的日期?如何創建計算字段?如何刪除字段? - Rethinkdb
1.How從下面的數據過濾最大日期:
[
{"TimeStamp": Fri Oct 11 2013 05:51:12 GMT+00:00},
{"TimeStamp": Thu Oct 10 2013 15:41:09 GMT+00:00},
{"TimeStamp": Thu Oct 10 2013 15:44:04 GMT+00:00}
]
2.How創建計算字段我有這樣的數據在rethinkdb
[
{id: 1, sales: 1000, discount: 0.1},
{id: 2, sales: 2000, discount: 0.2},
{id: 3, sales:3000, discount: 0.1}
]
我怎樣才能變換如下:
[{id: 1, sales: 1000, discount: 0.1, discAmt: 100, netSales: 900},
{id: 2, sales: 2000, discount: 0.2, discAmt: 400, netSales: 1600},
{id: 3, sales: 3000, discount: 0.1, discAmt: 300, netSales: 2700}
]
如何從上面刪除折扣字段?