サンプルコードの最大値と異なる値を返すMySQL

Question

playertrackerテーブルでは、プレイヤーID（PID）が等しい値が最も高い行に関連付けられたデッキ名が表示されます。与えられた値に。代わりに、最初のデッキ名が最大額とともに返されます。

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; 

Link to the offending SQL

Answer 1

これはクエリであるが

swim 9 
fall 9 

よう

ので、2行

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

を返します

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

Answer 2

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