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Create Table Person (
ID integer primary key
, [name] character(15) not null
, address character(15)
, phone integer
);
Create Table Surveyor (
surveyID integer
, certificationDate Datetime
, ID integer
, primary KEY (surveyID,ID)
, FOREIGN KEY (ID) REFERENCES Person
);
Create Table Points (
PntID integer primary key
, N float not null
, E float not null
, Height float not null
);
Create Table Polygon (
polyID integer primary key
, area float not null
, atleastonepoint integer not null
, foreign key (atleastonepoint) references Points(PntID)
, check (area > 0)
);
Create Table Block (
blockID integer
, blockName character (15) not null
, polyID integer
, polyLength float not null
, primary KEY (blockID,polyID)
, onemunicipalAuthority character (15) not null
, foreign key (polyID) references polygon
, check (polyLength > 0)
);
Create Table Parcel (
parcelname character (15)
, blockID integer
, polyID integer
, primary KEY (parcelname,blockID,polyID)
, foreign key (polyID) references polygon
, foreign key (blockID) REFERENCES block
);
錯誤的問題:關係必須在相同數量的字段具有相同的數據類型,當我嘗試執行最後一個,CREATE =>包裹
我有一個SQL語句
感謝名單預先
'Block'具有由化合物主鍵**兩列**(BLOCKID,polyID),因此任何外鍵引用THA噸PK必須**還**使用這兩列 - 錯誤是非常明確的.... –