Question

我目前正在研究一个SQLite查询，它必须向我回复所有能够完成游戏中每个角色的玩家。我目前有这个代码：

SELECT pr.name 
    FROM (SELECT DISTINCT p.name name, c.role role
            FROM players p, playerchampions pc, champions c 
                WHERE (p.name = pc.playername) & (pc.championname = c.name)) pr
                    WHERE COUNT(pr.name) = COUNT(DISTINCT pr.role)

我的想法是，我只是检查玩家是否可以履行与游戏中不同角色相同数量的角色，但是我误用了聚合函数COUNT（）错误。我该怎么处理？

Answer 1

此查询可以这样写：

SELECT players.name
FROM players
JOIN playerchampions ON players.name = playerchampions.playername
GROUP BY players.name
HAVING COUNT(playerchampions.championname) = (SELECT COUNT(DISTINCT role)
                                              FROM champions)

SQLite将计数值作为条件

1 个答案: