Re: linking

si wrote:
>Please can you help:

>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 w
>here 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 al
>so need to create the DEPT relation automatically.

In 7.1 you can simply do this:

junk=# Insert into Employee values (1,'Slate',
junk(# (select DEPT_NO from DEPARTMENT where DESCRIPTION = 'Administration'
and location = 'Bedrock'));
INSERT 2085500 1

junk=# select * from department;
location | description | dept_no
----------+----------------+---------
Bedrock | Administration | 1
(1 row)

junk=# select * from employee;
empl_id | name_last | dept
---------+-----------+------
1 | Slate | 1
(1 row)

However, if you do this, you need a unique index on (location, description);
at the moment you could have more than one dept_no for the same combination.

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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