Question

如何获取具有特定产品清单的订单清单这是我的桌子

Order_Id  Products_Id
O1        P123
O1        P124
O1        P125
O1        P126
O1        P127
O2        P127
O2        P123
O2        P125
O2        P128
O3        P123
O3        P124
O3        P127

查询以获取产品ID为P127，P123的所有订单的列表（不仅2个项目，动态项目列表）请帮助我。

关于，萨蒂亚

Answer 1

您可以使用sum() { this.total = this.people.reduce((a, b)=>a + b); } ngOnInit() { this.sum(); this.max = this.people.reduce((a, b)=>Math.max(a, b)); this.min = this.people.reduce((a, b)=>Math.min(a, b)); this.average = (this.total / this.arrayLength); } <span *ngFor="let p of people" style="font-size:18px">{{p}} </span><br><br> <button >Quantity</button> = {{arrayLength}}<Br><br> <button >Average</button> = {{average}}<Br><br> <button >Sum</button> <span > = {{total}}</span><Br><br> <button >Max</button> <span > = {{max}}</span><Br><br> <button >Min</button> <span > = {{min}}</span><Br><br>和group by：

having

“ 2”是您要寻找的产品数量。

如果不允许重复，则使用select order_id from orders o where product_id in ('P127', 'P123') group by order_id having count(distinct product_id) = 2;代替count(*)。

Answer 2

您可以如下查询：

SELECT order_id
  FROM orders
 GROUP BY ORDER_ID
 HAVING products_id IN (&products_id);

查询以获取具有特定产品列表的订单

2 个答案: