Two foreign keys : Foreign Key « Key « SQL / MySQL

1. SQL / MySQL
2. Key
3. Foreign Key

Two foreign keys

      
mysql>
mysql>
mysql> CREATE TABLE EmployeeS(
    ->          EmployeeNO       INTEGER      NOT NULL,
    ->          NAME           CHAR(15)     NOT NULL,
    ->          INITIALS       CHAR(3)      NOT NULL,
    ->          BIRTH_DATE     DATE                 ,
    ->          SEX            CHAR(1)      NOT NULL,
    ->          JOINED         SMALLINT     NOT NULL,
    ->          STREET         VARCHAR(30)  NOT NULL,
    ->          HOUSENO        CHAR(4)              ,
    ->          POSTCODE       CHAR(6)              ,
    ->          TOWN           VARCHAR(30)  NOT NULL,
    ->          PHONENO        CHAR(13)             ,
    ->          LEAGUENO       CHAR(4)              ,
    ->          PRIMARY KEY    (EmployeeNO)           );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> CREATE   TABLE TEAMS
    ->         (TEAMNO     INTEGER NOT NULL,
    ->          EmployeeNO   INTEGER NOT NULL,
    ->          DIVISION   CHAR(6) NOT NULL,
    ->          PRIMARY KEY (TEAMNO),
    ->          FOREIGN KEY (EmployeeNO) REFERENCES EmployeeS (EmployeeNO));
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> CREATE   TABLE MATCHES
    ->         (MATCHNO     INTEGER NOT NULL,
    ->          TEAMNO      INTEGER NOT NULL,
    ->          EmployeeNO    INTEGER NOT NULL,
    ->          WON         INTEGER NOT NULL,
    ->          LOST        INTEGER NOT NULL,
    ->          PRIMARY KEY (MATCHNO),
    ->          FOREIGN KEY (TEAMNO) REFERENCES TEAMS (TEAMNO),
    ->          FOREIGN KEY (EmployeeNO) REFERENCES EmployeeS (EmployeeNO));
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>

   
    
    
    
    
    
  

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