Question

您好我有这两个表：

(1, Anaheim, P)
(2, Arizona, P)
(3, Boston, S)
(4, Buffalo, M)
(5, Detroit, M)

和

(1, date, 1, 2)
(2, date, 2, 3)
(3, date, 5, 3)

团队数据示例：

class Person {
  constructor(obj, classMap) {
    for (let prop of Object.keys(classMap)) {
      this[prop] = new classMap[prop](obj[prop]);
    }
  }
}

let p = new Person(obj, { address: Address });

和匹配：

int[][] x = {{3,1,4},{1,5,9}};
int[] y = {2,6,7};

结果应该只是阿纳海姆（在同一个分区对阵亚利桑那州）

我想只列出球队的名字，这些名字只对同一赛区的球队进行比赛。我怎么能在SQL和关系代数中做到这一点？除法只是字符值。谢谢你的帮助...

Answer 1

SELECT t1.team_name AS team_name1,
       t2.team_name AS team_name2
FROM   team t1
       INNER JOIN match m
       ON ( t1.team_id = m.team_team_id )
       INNER JOIN team t2
       ON ( t2.team_id = m.team_team_id1 )
WHERE  t1.division = t2.division

SQL连接表和比较同一列中的值

1 个答案: