SQL 外键 - 表或视图不存在

Question

Create Table Address (
HouseNo NUMBER,
Street VARCHAR2(30),
constraint address_id_nn PRIMARY KEY(HouseNo,Street,City),
city VARCHAR2(20) REFERENCES City(City),
zip NUMBER(6) CHECK(zip >=0),
state varchar2(25));

While running the query i get the message "table or view does not exist".Can any one tell why do we get this?

Answer 1

Remove the part REFERENCES City(City) and it should work.

The REFERENCES clause always refers to a different table than the one you are currently creating. See the first example in https://www.w3schools.com/sql/sql_foreignkey.asp

Answer 2

If the table City really exists, so you must have necessary Grants, at least SELECT (I think you don't have SELECT grant on this table or view, you can not see it) and REFERENCES (as Stick bit recommand to you). To test if the table exist, you can tape in your SQL Developer or SQL*Plus:

SELECT count(*) FROM CITY;

If you have this error message "table or view does not exist", ask your DBA to allowing you the SELECT & REFERENCES (as said by Sticky bit) GRANTS. Or prefix City by its owner (or schema) like HR .City to acceed id.

If you don't have any error messages. So, be sure the table CITY contains the CITY column. To verify this, tape and execute:

DESC city;

This will show you all columns of the City table, and you can see if city Column really exists and its type.