Re: Joins in ORACLE

Thanks Sybrand, I'll look out for it

Chris Val

"Sybrand Bakker" <postbus_at_sybrandb.demon.nl> wrote in message news:tbutvsbjm21r2d_at_beta-news.demon.nl...
:
: "Chris" <CHRISVAL_at_bigpond.com.au> wrote in message
: news:cdJv6.3741$45.18331_at_newsfeeds.bigpond.com...
: > "Steve Bell" <swayne.bell_at_sympatico.ca> wrote in message
: > news:3ABF5748.3047AC70_at_sympatico.ca...
: > : Hi Chris,
: > :
: > : The very short answer to this.......
: > : In a normailized relational database there is often
 the
 requirement to
: > : SELECT information from more than one table at a time
 to
 get meaningful
: > : results (for example, if EMPLOYEE is a child table of
 DEPARTMENT you may
: > : simultaneously need to select columns from both tables
 to
 determine the
: > : name of the department corresponding to each
 employee).
: > : To do this you include in your WHERE clause a
 condition
 similar in form
: > : to:
: > : where childtable.foreignkey = parenttable.primarykey
: > :
: > : This syntax, known as an equijoin, will only return
 rows
 where a record
: > : exists in both tables.
: > : There are other kinds of joins, but this is the first
 you
 will
: > : encounter.
: > :
: > : If you're interested you can pick up almost any book
 on
 SQL and it
: > : should give you examples of the different kinds. Try
 to
 find one that
: > : uses the syntax that Oracle uses; they'll usually say.
: > :
: > : Hope this can get you started,
: > : Steve
: > :
: > : Chris wrote:
: > :
: > : > Hi everyone, I'm at school currently learning Oracle
: > : > as one of my subjects. I recently heard a few people
: > : > speaking about Joins and since I will be covering
 them
: > : > next term, I'd like to get a head start on
 understanding
: > : > them. My question is, can someone please explain the
: > : > concept of joins or point me in the right direction,
 or
 even
: > : > a small sample piece of code would be great.
: > : >
: > : > Any help appreciated.
: > : >
: > : > Thank You
: > : > Chris Val
: >
: >
: > Thanks for your help Steve, it looks pretty simple after
: > all.
: > now I can look into it further with some confidence.
: > BTW::) I am looking to buy a good book on oracle very
 soon
: > as the ones we are provided with at school are, well
 lets
: > just
: > say they are very slim (20 Pages in fact LOL)...
: >
: > Thanks again Steve.
: >
: > Chris Val
: >
: >
:
: Buy the book on SQL by Rick van der Lans. It originally
 appeared in Dutch in
: 1986 and has been translated into English many years ago.
 Amazon sells it.
:
: Hth,
:
: Sybrand Bakker, Oracle DBA
:
:
:
Received on Tue Mar 27 2001 - 00:08:35 CST