检索具有最大值 mysql 的行

Question

我刚刚开始我的 sql 冒险，我在检索分配给它的最大整数的行时遇到了问题（在不同的列中）。我只想说我检查了大线程上提供的解决方案，例如： SQL select only rows with max value on a column 但我无法在我的案例中使用它，所以如果这将被视为重复问题，我深表歉意。

这是我目前拥有的代码：

SELECT FinalSet.stageName, MAX(Salary) AS 'Biggest Salary'
FROM (
        SELECT FirstSet.stageName, SUM(dailySalary) AS Salary
        FROM (
                SELECT C.stageName, P.dailySalary
                FROM Participant P, Contender C
                WHERE P.contender = C.idContender
        ) FirstSet
        GROUP BY stageName
) FinalSet
GROUP BY stageName;

这就是我得到的输出：

| stageName    | Biggest Salary |
---------------------------------
| DJ Smith     | 200            |
| Echo Beavers | 270            |
| Jazzy Beast  | 220            |
| Pianoman     | 180            |
| Purple bolt  | 240            |
| Summer Hoops | 250            |

当我删除代码的最后一行时 (GROUP BY stageName;) 我得到了这个：

| stageName    | Biggest Salary |
---------------------------------
| DJ Smith     | 270            |

显然，最高薪水还可以，但 stageName 不行。我只想补充一点，它必须在一个查询中完成，我无法创建或更改任何 tables.

这是竞争者table:

CREATE TABLE Contender (
    idContender INTEGER UNIQUE NOT NULL AUTO_INCREMENT,
    coach INTEGER NOT NULL,
    stageName VARCHAR(30) NOT NULL,
    type VARCHAR(10) NOT NULL,
    PRIMARY KEY (idContender),

    FOREIGN KEY (coach)
            REFERENCES Coach(idCoach)
);

这是参与者 table:

CREATE TABLE Participant (
    idParticipant INTEGER UNIQUE NOT NULL AUTO_INCREMENT,
    contender INTEGER NOT NULL,
    name VARCHAR(20) NOT NULL,
    surname VARCHAR(30) NOT NULL,
    DoB DATE,
    phone VARCHAR(20),
    dailySalary INTEGER,
    gender VARCHAR(10),
    PRIMARY KEY (idParticipant),

    FOREIGN KEY (contender)
            REFERENCES Contender(idContender)
);

Answer 1

下面需要吗-

SELECT C.stageName, SUM(P.dailySalary) AS Salary
  FROM Participant P, Contender C
 WHERE P.contender = C.idContender
 GROUP BY stageName
 ORDER BY Salary DESC
 LIMIT 1;

检索具有最大值 mysql 的行

Retrieving the row with the biggest value mysql

mysql

greatest-n-per-group