Question

我想从一个简单的数据库表中提取名字，#kills，＃deaths。

表格有

_from（杀手），_to（死亡的人），然后是事件的窃听。在pvp的情况下，我们想要计算这个人是否死亡或者被杀死并将其添加到他们的总数中

这可以通过查询完成，还是我必须编写脚本？这不是@ all：

SELECT (select COUNT( _from ) from wiretaps group by _from) as num_kills, 
       (select COUNT( _to ) from wiretaps group by _to) as num_deaths, 
        _from as name
FROM wiretaps
WHERE message LIKE  "%PvP:%"

http://sqlfiddle.com/#!2/1e5d9/1

| _FROM |    _TO | MESSAGE | ID |
---------------------------------
|  naez |  salty |    PvP: |  1 |
|  naez | prince |    PvP: |  2 |
| chuck |   naez |    PvP: |  3 |

预期产出：

| name |    num_kills | num_deaths |
---------------------------------
|  naez   |  2 |    1 | 
|  prince |  0 |    1 | 
| chuck   |  1 |    0 | 
| salty   |  0 |    1 |

Answer 1

select name, sum(num_kills) num_kills, sum(num_deaths) num_deaths
from (
    select _from name, count(*) num_kills, 0 num_deaths
    from wiretaps
    where message like '%PvP:%'
    group by _from
    union all
    select _to name, 0 num_kills, count(*) num_deaths
    from wiretaps
    where message like '%PvP:%'
    group by _to) x
group by name

SQLFIDDLE

试图获取简单数据库表的计数统计信息

1 个答案: