我有这些表,但只设法创建
其他人正在给我错误,例如,
"Cant create table" on Loan_Item,
"Reference_Id dont exist" on Historical_Era_Reference
"error 1064 (4200)" on Loan
CREATE TABLE Insurance_Policy_Type (
Insurance_Policy_Type_Id INT (4),
Insurance_Policy_Type_Name VARCHAR (30),
PRIMARY KEY (Insurance_Policy_Type_Id));
CREATE TABLE Historical_Era (
Historical_Era_Id INT (4),
Historical_Era_Name VARCHAR (30),
PRIMARY KEY (Historical_Era_Id));
CREATE TABLE Reference (
Reference_Id INT (4),
Reference_Name VARCHAR (30),
Author VARCHAR (30),
PRIMARY KEY (Reference_Id));
CREATE TABLE Region (
Region_Id INT (4),
Region_Name VARCHAR (30),
PRIMARY KEY (Region_Id));
CREATE TABLE Organisation (
Organisation_Id INT (4),
Organisation_Name VARCHAR (30),
PRIMARY KEY (Organisation_Id));
CREATE TABLE Items (
Item_Id INT (4),
Item_Name VARCHAR (30),
Description VARCHAR (30),
Insurance_Policy_Type_Id INT (4),
Geo_Area_Id INT (4)
PRIMARY KEY (Item_Id),
FOREIGN KEY (Insurance_Policy_Type_Id) REFERENCES Insurance_Policy_Type(Insurance_Policy_Type_Id),
FOREIGN KEY (Geo_Area_Id) REFERENCES Geographic_Area(Geo_Area_Id));
CREATE TABLE GeoArea_HistEra (
Geo_Area_Id INT (4),
Historical_Era_Id INT (4),
FOREIGN KEY (Geo_Area_Id) REFERENCES Geographical_Area(Geo_Area_Id)),
FOREIGN KEY (Historical_Era_Id) REFERENCES Historical_Era(Historical_Era_Id));
CREATE TABLE Historical_Era_Reference (
References_Id INT (4),
Historical_Era_Id INT (4),
FOREIGN KEY (Reference_Id) REFERENCES Reference (Reference_Id),
FOREIGN KEY (Historical_Era_Id) REFERENCES Historical_Era (Historical_Era_Id));
CREATE TABLE Loan_Item (
Item_Id INT (4),
Loan_Id INT (4),
FOREIGN KEY (Item_Id) REFERENCES Items(Item_Id),
FOREIGN KEY (Loan_Id) REFERENCES Loan(Loan_Id));
CREATE TABLE Geographic_Area (
Geo_Area_Id INT (4),
Geo_Area_Name VARCHAR (30),
Region_Id INT (4),
PRIMARY KEY (Geo_Area_Id),
FOREIGN KEY (Region_Id) REFERENCES Region (Region_Id));
CREATE TABLE Loan (
Loan_Id INT (4),
Item_Id INT (4)
Organisation_Id INT(4)
Loan_Start DAY,
Loan_End DAY
FOREIGN KEY (Organisation_Id) REFERENCES Organisation (Organisation_Id),
FOREIGN KEY (Item_Id) REFERENCES Items (Item_Id));
答案 0 :(得分:2)
首先尝试创建表,然后再添加外键。
答案 1 :(得分:0)
上面的查询存在很多问题。
您正在引用尚不存在的表:"FOREIGN KEY (Geo_Area_Id) REFERENCES Geographic_Area(Geo_Area_Id));"
首先创建表,然后更新外键。
有很多语法错误 - 缺少逗号和双括号。我建议学习如何发现它们,而不是逐一指向它们,例如我建议使用IDE。我个人在MySQL Workbench中测试语句。
由于多种原因,查询可能会产生错误150。有关主键为FK in the first answer here的典型错误,请参阅非常好的摘要。