linking

Please can you help:

+--------------------------------------+
| DEPARTMENT |
+----------+----------------+----------+
| LOCATION | DESCRIPTION | DEPT_NO |
+----------+----------------+----------+
| Bedrock | Administration | 1 |
| Bedrock | Quarry | 2 |
| Redcliff | Stockpile | 3 |
+----------+----------------+----------+

+-----------------------------+
| EMPLOYEE |
+---------+------------+------+
| EMPL_ID | NAME_LAST | DEPT |
+---------+------------+------+
| 1 | Slate | 1 |
| 4 | Flintstone | 2 |
| 5 | Rubble | 2 |
| 7 | Rockhead | 3 |
| 11 | Gravel | 1 |
+---------+------------+------+

create sequence increment start 1 increment 1 maxvalue 2147483647 minvalue 1 cache 1;

create table DEPARTMENT (
LOCATION varchar(30),
DESCRIPTION varchar(30),
DEPT_NO int unique not null default nextval('increment') primary key
);

create table EMPLOYEE (
EMPL_ID int unique not null primary key,
NAME_LAST varchar(20),
DEPT int references DEPARTMENT (DEPT_NO)
);

Insert into DEPARTMENT values ('Bedrock','Administration');

Insert into Employee values ('1','Slate','????');

How do I replace ???? to automatically get the DEPT_NO value?

e.g. In theory I need to replace ???? with (select DEPT_NO from DEPARTMENT where location = 'Administration' and DESCRIPTION = 'Bedrock';) but I am not sure how to do this all in 1 statement.

The DEPT_NO is automatically created if no value is given, which is why I also need to create the DEPT relation automatically.

Thanks,
Si

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