错误引用的表中没有主键或候选键

Question

I'm getting this error when trying to create a table with foreign key:

There are no primary or candidate keys in the referenced table 'TeamToPlayers' that match the referencing column list in the foreign key 'FKey2'.

I don't understand why, there is a primary key in the table TeamToPlayers .

Here are the queries:

create table TeamToPlayers
(TeamName varchar(50) NOT NULL,
  PlayerName varchar(50) NOT NULL,
  primary key(TeamName,PlayerName),
  CONSTRAINT FKey FOREIGN KEY (TeamName) REFERENCES Teams(TeamName)
)

create table Players
(PlayerName varchar(50) NOT NULL,
primary key(PlayerName),
CONSTRAINT FKey2 FOREIGN KEY (PlayerName) REFERENCES TeamToPlayers(PlayerName)
);

Answer 1

Table TeamToPlayers primary key consists of two fields - you must reference both as otherwise it's not a key. I think you may have your key the wrong way round - it should be on TeamToPlayers and referencing Players like so:

create table TeamToPlayers
(   
    TeamName varchar(50) NOT NULL,
    PlayerName varchar(50) NOT NULL,
    primary key(TeamName,PlayerName),
    CONSTRAINT FKey FOREIGN KEY (TeamName) REFERENCES Teams(TeamName),
    CONSTRAINT FKey2 FOREIGN KEY (PlayerName) REFERENCES Players(PlayerName)
)

create table Players
(PlayerName varchar(50) NOT NULL,
primary key(PlayerName),
);