Question

我正在尝试创建4个表格层次结构-运动类别，联赛，团队和玩家。直到这一刻，这就是我创造的：

      -- Create PLAYER table
create table PLAYER
(
  PLAYER_ID           INT not null,
  NAME_OF_PLAYER         VARCHAR(36) not null,
  NUMBER_OF_PLAYER      INT not null,
  TEAM_ID                   INT not null
) ;

alter table PLAYER
  add constraint PLAYER_PK primary key (PLAYER_ID);

alter table PLAYER MODIFY COLUMN PLAYER_ID INT auto_increment;

alter table PLAYER
  add constraint PLAYER_UK unique (NAME_OF_PLAYER, TEAM_ID);


     -- Create TEAM table
create table TEAM
(
  TEAM_ID           INT not null,
  NAME_OF_TEAM          VARCHAR(36) not null,
  LEAGUE_ID         INT not null
) ;

alter table TEAM
  add constraint TEAM_PK primary key (TEAM_ID);

alter table TEAM MODIFY COLUMN TEAM_ID INT auto_increment;

alter table TEAM
  add constraint TEAM_UK unique (NAME_OF_TEAM);



    -- Create LEAGUE table
create table LEAGUE
(
  LEAGUE_ID           INT not null,
  NAME_OF_LEAGUE          VARCHAR(36) not null,
  SPORT_CATEGORY_ID         INT not null
) ;

alter table LEAGUE
  add constraint LEAGUE_PK primary key (LEAGUE_ID);

alter table LEAGUE MODIFY COLUMN LEAGUE_ID INT auto_increment;

alter table LEAGUE
  add constraint LEAGUE_UK unique (NAME_OF_LEAGUE);



   -- Create Sport_Category table
create table SPORT_CATEGORY
(
  SPORT_CATEGORY_ID           INT not null,
  NAME_OF_CATEGORY          VARCHAR(36) not null
) ;

alter table SPORT_CATEGORY
  add constraint SPORT_CATEGORY_PK primary key (SPORT_CATEGORY_ID);



alter table SPORT_CATEGORY MODIFY COLUMN SPORT_CATEGORY_ID INT auto_increment;



alter table SPORT_CATEGORY
  add constraint SPORT_CATEGORY_UK unique (NAME_OF_CATEGORY);



alter table PLAYER
  add constraint PLAYER_FK foreign key (TEAM_ID)
  references TEAM (TEAM_ID);

alter table TEAM
  add constraint TEAM_FK1 foreign key (LEAGUE_ID)
  references LEAGUE (LEAGUE_ID);


alter table LEAGUE
  add constraint LEAGUE_FK1 foreign key (SPORT_CATEGORY_ID)
  references SPORT_CATEGORY (SPORT_CATEGORY_ID);

当我执行此sql文件时，大约需要15秒才能完成。通过一些测试，我注意到alter table语句会使它变慢。这种关系表正常吗？是因为表格的复杂性吗？

我刚开始处理关系，但对此非常热情。任何帮助将不胜感激。

Alter Table命令执行需要很长时间

0 个答案: