Question

我有两个具有以下结构的表：

     WEEKLY                   MONTHLY
|Name|Kills|Deaths|      |Name|Kills|Deaths|
 __________________      __________________
|B   |  1  |  12  |      |B   | 43  |  12  | 
|A   |  3  |  25  |      |A   |  9  |  25  |
|D   |  4  |   2  |      |D   |  8  |   2  | 
|C   |  5  |   4  |      |C   |  5  |   4  |
|F   |  2  |   8  |      |F   | 10  |   8  |

我需要通过杀/死率来检索它们，我相信这可以用MySQL做，但是当我意识到需要将两个表合并然后命令结果时，事情变得棘手。

以下适用于1张桌子：

mysql> SELECT * FROM weekly ORDER BY kills/deaths DESC;

但我怎样才能在两张桌子上做到这一点？

Answer 1

尝试：

SELECT WEEKLY.Name, WEEKLY.Kills+MONTHLY.Kills Kills, WEEKLY.Deaths+MONTHLY.Deaths Deaths
FROM WEEKLY INNER JOIN MONTHLY ON WEEKLY.Name=MONTHLY.Name
ORDER BY (WEEKLY.Kills+MONTHLY.Kills)/(WEEKLY.Deaths+MONTHLY.Deaths) DESC;

Answer 2

如果我们需要通过结合这两个表来结合：

SELECT * FROM (SELECT * FROM weekly UNION SELECT * FROM monthly) u
ORDER BY kills / deaths DESC;

如果我们需要通过添加相同名称的杀戮和死亡来结合使用：

SELECT 
    u.name, 
    SUM(u.kills) kills, 
    SUM(u.deaths) deaths,
    IFNULL(SUM(u.kills) / SUM(u.deaths), 2147483647) ratio
FROM (SELECT * FROM weekly UNION SELECT * FROM monthly) u
GROUP BY u.name
ORDER BY ratio DESC, kills DESC;

Answer 3

SELECT a.*,b.* 
FROM weekly a inner join  MONTHLY b
on a.name = b.name
ORDER BY (a.kills+b.kills)/(a.deaths+b.deaths) DESC;

MySQL结合两个表并按顺序排列？

3 个答案: