复合键的Oracle问题-Java 学习之路

这里有点令人困惑的问题：我正在尝试从复合PK创建复合FK . 我会告诉你我的 table ，我有问题;

CREATE TABLE Weapons (
Weapon_ID VARCHAR(10) NOT NULL,
Weapon_Name VARCHAR(30),
Range_In_Meters INT,
Maximum_Number_Of_Uses INT,
Damage_Factor INT,
Cost INT,
primary key(Weapon_ID));

CREATE TABLE WeaponInventory (
Inventory_ID VARCHAR(30) NOT NULL,
WeaponInventory_ID Varchar(10) NOT NULL,
Weapon_ID VARCHAR(10) REFERENCES Weapons(Weapon_ID) NOT NULL,
primary key(Inventory_ID, WeaponInventory_ID));

CREATE TABLE Avatars (
Avatar_ID VARCHAR(10) NOT NULL,
Avatar_Name VARCHAR(30),
AvA_DOB DATE,
Age VARCHAR(30),
Gender VARCHAR(30),
Strength_Indicated INT,
Hoard INT,
Avatar_Level VARCHAR(30),
Skill VARCHAR(30),
Original_Owner VARCHAR(30),
Family_ID VARCHAR(10) NOT NULL,
Species_ID VARCHAR(10) NOT NULL,
Inventory_ID VARCHAR(30) NOT NULL,
Weapon_ID VARCHAR(10) NOT NULL,
Player_ID VARCHAR(10) NOT NULL,
PRIMARY KEY (Avatar_ID),
FOREIGN KEY (Inventory_ID, Weapon_ID)
REFERENCES WeaponInventory (Inventory_ID, Weapon_ID));

在Avatars表中，我一直试图创建这个外键，但我没有运气 . 我有错误，例如：

ORA-02270：此列列表没有匹配的唯一键或主键

和：

ORA-02270：此列列表没有匹配的唯一键或主键

任何帮助将不胜感激！我一直感到困惑，最终在同一个地方！（：

1 回答

我想你打算在表 WeaponInventory 中引用 WeaponInventory_ID 列（而不是 Weapon_ID ）：

FOREIGN KEY (Inventory_ID, Weapon_ID)
REFERENCES WeaponInventory (Inventory_ID, WeaponInventory_ID) -- see here

请注意 Weapon_ID 不是 WeaponInventory 中PK的一部分：

CREATE TABLE WeaponInventory (
  Inventory_ID VARCHAR(30) NOT NULL,
  WeaponInventory_ID Varchar(10) NOT NULL,
  Weapon_ID VARCHAR(10) REFERENCES Weapons(Weapon_ID) NOT NULL,
  primary key(Inventory_ID, WeaponInventory_ID) -- Weapon_ID is not part of PK
);

检查这个Fiddle .

回复于 2024-05-04T23:41:10+08:00

复合键的Oracle问题

1 回答

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