Is it unique?

Some things to share…

I have been awfully quiet on my blog lately. I think that is because I have been busy with other things, like my garden and stuff like that. There are some ‘techie’ thing I have done in the meantime, though,

Tech14-Ive_SubmittedI have submitted a couple of abstracts for Tech14. Hope at least one of them gets selected. I really like presenting and if it is in a different country, that is just a plus. That (more...)


plsql_logoThere is a ‘rule’, I think it was created by Tom Kyte, stating: If you can do it in SQL, do it in SQL. I came across some code the other day that makes perfect sense to do then you are running an Oracle 10g (or earlier) instance. I rewrote the code to use only the EMP and DEPT tables to protect the suspects and maybe innocent.

The function defined is something like this:

Oracle PL/SQL Programming 6th edition by Steven Feuerstein

opp6_catI have reviewed the latest edition of Oracle PL/SQL Programming. This is not a book, at least for me, that I would read front to back. I use it mostly as a reference, but the great thing about this book is that you can also use this book to learn programming PL/SQL from scratch.

The book is nicely ordered into different parts, like Program structure and how to use SQL in PL/SQL (which by the (more...)


After a presentation by Lucas Jellema I decided to try something with types in Oracletable_EMP. One of the issues posed in this presentation was that the type cannot include self-reference. Neither direct nor indirect.

A table like the emp table cannot be expressed as an object type. The table has a column mgr which is a reference to another employee.

So I tried something like this: