表またはビューが

Question

DROP TABLE BASIC_USER; 
DROP TABLE ADMIN_USER; 
DROP TABLE EQUIPMENT; 
DROP TABLE CAVE; 
DROP TABLE DUNGEON; 
DROP TABLE ADVENTURE; 
DROP TABLE AUTHOR; 
DROP TABLE CHARACTER_GROUP; 
DROP TABLE MY_CHARACTER; 
DROP TABLE MY_USER; 

CREATE TABLE MY_USER (
    user_ID int NOT NULL, 
    nick varchar(255) NOT NULL, 
    date_of_registration date DEFAULT current_date, 
    first_name varchar(255) NOT NULL, 
    last_name varchar(255), 
    email varchar(255) UNIQUE, 
    age int NOT NULL, 
    user_location varchar(255), 
    finished_adventures int DEFAULT 0 NOT NULL, 
    PRIMARY KEY(user_ID) 
); 

CREATE TABLE MY_CHARACTER (
    character_ID int NOT NULL, 
    owner_ID int REFERENCES MY_USER(user_ID), 
    char_name varchar(255) NOT NULL, 
    race varchar(255) NOT NULL, 
    char_class varchar(255) NOT NULL, 
    char_rank int NOT NULL, 
    hp int NOT NULL, 
    status int NOT NULL, 
    CHECK (char_rank <= 99 AND char_rank >= 0), 
    CHECK (hp <= 100 AND hp >= 0), 
    CHECK (status <= 1 AND status >= 0), 
    PRIMARY KEY(character_ID) 
); 

CREATE TABLE EQUIPMENT (
    equipment_ID int NOT NULL, 
    owner_ID int REFERENCES MY_CHARACTER(character_ID), 
    equipment_name varchar(255) NOT NULL, 
    equipment_type varchar(255) NOT NULL, 
    attack int NOT NULL, 
    defense int NOT NULL, 
    PRIMARY KEY(equipment_ID) 
); 

CREATE TABLE DUNGEON (
    dungeon_ID int NOT NULL, 
    dungeon_location varchar(255), 
    dungeon_difficulty int NOT NULL, 
    goal varchar(2500), 
    status int NOT NULL, 
    dungeon_creator_ID int REFERENCES AUTHOR(author_ID), 
    CHECK (dungeon_difficulty <= 5 AND dungeon_difficulty >= 0), 
    PRIMARY KEY(dungeon_ID) 
); 

CREATE TABLE ADVENTURE (
    adventure_ID int NOT NULL, 
    adventure_name varchar(255) NOT NULL, 
    adventure_location varchar(255) NOT NULL, 
    adventure_difficulty int NOT NULL, 
    participant_ID int REFERENCES CHARACTER_GROUP(chargroup_ID), 
    adventure_goal varchar(2500), 
    creator_ID int REFERENCES AUTHOR(author_ID), 
    PRIMARY KEY (adventure_ID) 
); 

CREATE TABLE CHARACTER_GROUP (
    chargroup_ID int NOT NULL, 
    group_participant_ID int NOT NULL REFERENCES MY_CHARACTER(character_ID) 
); 

CREATE TABLE CAVE (
    game_room_ID int NOT NULL, 
    cave_name varchar(255) NOT NULL, 
    dm_ID int REFERENCES MY_USER(user_ID), 
    dungeon_sub int REFERENCES DUNGEON(dungeon_ID), 
    adventure_sub int REFERENCES ADVENTURE(adventure_ID), 
    cave_creation_date date DEFAULT current_date NOT NULL, 
    playing_group int REFERENCES CHARACTER_GROUP(chargroup_ID), 
    PRIMARY KEY(game_room_ID) 
); 

CREATE TABLE AUTHOR (
    author_ID int NOT NULL, 
    email varchar (255) UNIQUE, 
    nick varchar (255) UNIQUE 
); 

CREATE TABLE BASIC_USER(
    basic_ID int PRIMARY KEY REFERENCES MY_USER(user_ID) 
); 

CREATE TABLE ADMIN_USER(
    admin_ID int PRIMARY KEY REFERENCES MY_USER(user_ID), 
    permissions int NOT NULL, 
    specialization varchar(255) 
); 

エラー原因不明のエラーが存在しません：

Table BASIC_USER dropped.

Table ADMIN_USER dropped.

Table EQUIPMENT dropped.

Error starting at line : 4 in command - DROP TABLE CAVE Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action:

Error starting at line : 5 in command - DROP TABLE DUNGEON Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action:

Error starting at line : 6 in command - DROP TABLE ADVENTURE Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action: Table AUTHOR dropped.

Table CHARACTER_GROUP dropped.

Table MY_CHARACTER dropped.

Table MY_USER dropped.

Table MY_USER created.

Table MY_CHARACTER created.

Table EQUIPMENT created.

Error starting at line : 50 in command - CREATE TABLE DUNGEON (
dungeon_ID int NOT NULL, dungeon_location varchar(255),
dungeon_difficulty int NOT NULL, goal varchar(2500), status int NOT NULL, dungeon_creator_ID int REFERENCES AUTHOR(author_ID),
CHECK (dungeon_difficulty <= 5 AND dungeon_difficulty >= 0), PRIMARY KEY(dungeon_ID)) Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action:

Error starting at line : 61 in command - CREATE TABLE ADVENTURE (
adventure_ID int NOT NULL, adventure_name varchar(255) NOT NULL,
adventure_location varchar(255) NOT NULL, adventure_difficulty int NOT NULL, participant_ID int REFERENCES CHARACTER_GROUP(chargroup_ID), adventure_goal varchar(2500),
creator_ID int REFERENCES AUTHOR(author_ID), PRIMARY KEY (adventure_ID)) Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action: Table CHARACTER_GROUP created.

Error starting at line : 77 in command - CREATE TABLE CAVE (
game_room_ID int NOT NULL, cave_name varchar(255) NOT NULL, dm_ID int REFERENCES MY_USER(user_ID), dungeon_sub int REFERENCES DUNGEON(dungeon_ID), adventure_sub int REFERENCES ADVENTURE(adventure_ID), cave_creation_date date DEFAULT current_date NOT NULL, playing_group int REFERENCES CHARACTER_GROUP(chargroup_ID), PRIMARY KEY(game_room_ID)) Error report - SQL Error: ORA-00942: table or view does not exist 00942. 00000 - "table or view does not exist" *Cause:
*Action: Table AUTHOR created.

Table BASIC_USER created.

Table ADMIN_USER created.

この原因だ「表またはビューが存在しません」というエラーを何任意のアイデア？

Answer 1

参照先のテーブルを最初に定義することなく外部キーを定義することはできません。したがって、参照する前にすべてのテーブルを定義するようにDDLを並べ替えるだけです。 SQLは直接参照を許可しません。

循環依存関係を定義する必要があるシナリオがあります。したがって、最初にすべての表を定義し、適用制約を定義する方がよいでしょう。

Jonで示唆されているもう1つの方法は、CREATE SCHEMAステートメントを使用して、単一のトランザクションで複数のテーブルとビューを作成し、独自のスキーマで複数の付与を実行し、前方参照を使用できるようにすることです。

DROP TABLE BASIC_USER; 
DROP TABLE ADMIN_USER; 
DROP TABLE EQUIPMENT; 
DROP TABLE CAVE; 
DROP TABLE DUNGEON; 
DROP TABLE ADVENTURE; 
DROP TABLE AUTHOR; 
DROP TABLE CHARACTER_GROUP; 
DROP TABLE MY_CHARACTER; 
DROP TABLE MY_USER; 



CREATE TABLE AUTHOR (
    author_ID int NOT NULL, 
    email varchar (255) UNIQUE, 
    nick varchar (255) UNIQUE 
); 

CREATE TABLE MY_USER (
    user_ID int NOT NULL, 
    nick varchar(255) NOT NULL, 
    date_of_registration date DEFAULT current_date, 
    first_name varchar(255) NOT NULL, 
    last_name varchar(255), 
    email varchar(255) UNIQUE, 
    age int NOT NULL, 
    user_location varchar(255), 
    finished_adventures int DEFAULT 0 NOT NULL, 
    PRIMARY KEY(user_ID) 
); 



CREATE TABLE BASIC_USER(
    basic_ID int PRIMARY KEY REFERENCES MY_USER(user_ID) 
); 

CREATE TABLE ADMIN_USER(
    admin_ID int PRIMARY KEY REFERENCES MY_USER(user_ID), 
    permissions int NOT NULL, 
    specialization varchar(255) 
); 

CREATE TABLE MY_CHARACTER (
    character_ID int NOT NULL, 
    owner_ID int REFERENCES MY_USER(user_ID), 
    char_name varchar(255) NOT NULL, 
    race varchar(255) NOT NULL, 
    char_class varchar(255) NOT NULL, 
    char_rank int NOT NULL, 
    hp int NOT NULL, 
    status int NOT NULL, 
    CHECK (char_rank <= 99 AND char_rank >= 0), 
    CHECK (hp <= 100 AND hp >= 0), 
    CHECK (status <= 1 AND status >= 0), 
    PRIMARY KEY(character_ID) 
); 

CREATE TABLE EQUIPMENT (
    equipment_ID int NOT NULL, 
    owner_ID int REFERENCES MY_CHARACTER(character_ID), 
    equipment_name varchar(255) NOT NULL, 
    equipment_type varchar(255) NOT NULL, 
    attack int NOT NULL, 
    defense int NOT NULL, 
    PRIMARY KEY(equipment_ID) 
); 

CREATE TABLE DUNGEON (
    dungeon_ID int NOT NULL, 
    dungeon_location varchar(255), 
    dungeon_difficulty int NOT NULL, 
    goal varchar(2500), 
    status int NOT NULL, 
    dungeon_creator_ID int REFERENCES AUTHOR(author_ID), 
    CHECK (dungeon_difficulty <= 5 AND dungeon_difficulty >= 0), 
    PRIMARY KEY(dungeon_ID) 
); 

CREATE TABLE CHARACTER_GROUP (
    chargroup_ID int NOT NULL, 
    group_participant_ID int NOT NULL REFERENCES MY_CHARACTER(character_ID) 
); 

CREATE TABLE ADVENTURE (
    adventure_ID int NOT NULL, 
    adventure_name varchar(255) NOT NULL, 
    adventure_location varchar(255) NOT NULL, 
    adventure_difficulty int NOT NULL, 
    participant_ID int REFERENCES CHARACTER_GROUP(chargroup_ID), 
    adventure_goal varchar(2500), 
    creator_ID int REFERENCES AUTHOR(author_ID), 
    PRIMARY KEY (adventure_ID) 
); 

CREATE TABLE CAVE (
    game_room_ID int NOT NULL, 
    cave_name varchar(255) NOT NULL, 
    dm_ID int REFERENCES MY_USER(user_ID), 
    dungeon_sub int REFERENCES DUNGEON(dungeon_ID), 
    adventure_sub int REFERENCES ADVENTURE(adventure_ID), 
    cave_creation_date date DEFAULT current_date NOT NULL, 
    playing_group int REFERENCES CHARACTER_GROUP(chargroup_ID), 
    PRIMARY KEY(game_room_ID) 
);