MySQL返回的值与提供的示例代码中的最大值不同

Question

在playertracker表中，我希望结果显示与具有最高值的行相关联的牌组名称，其中玩家ID（PID）等于给定值。 而是返回第一个牌组名称以及最大量。

create table players(
  pid int(10),
  pname varchar(20),
  favcard varChar(20),
  mstplayed varChar(20),
  lestplayed varChar(20)
  );

 create table playertracker(
  pid int(10),
  deckName varchar(20),
  amount int(10)
  );

 Insert into players
   values(1, 'joe', 'swim', 'jump', 'fall'),(2, 'jane', 'up', 'jump', 'fall'),(3, 'jack', 'up', 'jump', 'fall'),
   (4, 'joe', 'up', 'all', '5'),(5, 'joe', 'up', 'red', 'fall');

 Insert into playertracker
   values('1','jump','2'),('1','up','4'),('1','swim','9'),('1','fall','9'),
   ('2','jump','8'),('2','up','4'),('2','swim','1'),('2','fall','1'),
   ('3','jump','1'),('3','up','8'),('3','swim','9'),('3','fall','4'),
   ('4','jump','9'),('4','up','8'),('4','swim','1'),('4','fall','1'),
   ('5','jump','1'),('5','up','4'),('5','swim','4'),('5','fall','8'),
   ('6','jump','4'),('6','up','9'),('6','swim','1'),('6','fall','1');


   select deckname, max(amount) from playertracker where pid = 1;

链接到违规的SQL

Answer 1

select deckname, max(amount) from playertracker where pid = 1 group by deckname;

Answer 2

这是查询但返回两行

select deckname, amount from playertracker where pid = 1
 and amount = (select max(amount) from playertracker where pid = 1) ;

因为

swim    9
fall    9

所以

select deckname, amount from playertracker where pid = 1
 and amount = (select max(amount) from playertracker where pid = 1)
 limit 1 ;