Differences between ANSI SQL and Oracle 8/9

Hallo,
i'm looking for good online texts or books concerning the problem "Differences between ANSI SQL and different database implementations (ORACLE, Informix, MySQL...)" I want to check a program written in C (with ESQL) that works with an Informix-DB. In this code i want to find code that is specific to the Informix-DB. I want to change the database, so all the code should be independent from a DB. Does anybody know texts or books concerning this problem?
thx
Marco Seum

Basically there is syntax difference between both of them.
Lets say i want to join two table EMP and DEPT based on DEPTNO.
With Oracle SQL format its like this.
select e.*
from emp e, dept d
where e.deptno = d.deptnoHere the joining condition goes in the WHERE clause.
With ANSI SQL format its like this.
select e.*
from emp e
join dept d
on e.deptno = d.deptnoHere the join condition is mentioned separately and not in WHERE clause.
Oracle supports ANSI SQL starting from 9i version.
You can read more about the syntax difference Here

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Basically there is syntax difference between both of them.
Lets say i want to join two table EMP and DEPT based on DEPTNO.
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Christophe Warland wrote:
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In the Oracle world, my understand is, INSTANCE = memory structure + physical database file (which pretty close to MS SQL identification). similar to MS SQL, you can have multiple INSTANCEs on each physical server. but which one is the 'DATABASE' in oracle world? The closest one i think is TABLESPACE. I can assign one or multiple physical data file for each TABLESPACE. but all the TABLESPACE place the redo log file inside the same undo TABLESPACE? also, for each application, i have to create one or more TABLESPACE inside a INSTANCE(that's what i usually do in MS SQL)?
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Edited by: user3614365 on Jun 14, 2012 2:57 PM

please forgive me if my question is too silly.Firs of all, your questions are not silly at all. You can get better understanding of one product by setting analogies and comparisons with a product you are familiar with. I used same method when I learned about MS SQL comparing it with Oracle.
So, welcome on Oracle board!
in MS SQL world, you can install multiple INSTANCE on a physical server, you can have multiple instances of Oracle, belonging to same or separate Oracle Home on same physical machine.
inside each INSTANCE, you can create multiple DATABASEs, In Oracle instance you can have only one database. That is how it is.
each DATABASE has it owned data\transaction log file on disk.Even in MS SQL there can be multiple data files per database.
>
In the Oracle world, my understand is, INSTANCE = memory structure + physical database file (which pretty close to MS SQL identification). similar to MS SQL, you can have multiple INSTANCEs on each physical server.
>
yes
>
but which one is the 'DATABASE' in oracle world? The closest one i think is TABLESPACE. I can assign one or multiple physical data file for each TABLESPACE. but all the TABLESPACE place the redo log file inside the same undo TABLESPACE?
>
Here is little similarity between Oracle TABLESPACE and MS SQL database.
In MS SQL Database has not only files associated with it, it has its own security and piece of data dictionary. It can have its own collation, you can detach it from one instance and attach to another, you can back it up separately, etc...
I would say MS DB is more "standalone and self-containig" unit, comparing to Oracle TS.
Oracle TS is a way of organizing data files and setting some default common storage properties for tables and other segments contained in TS.
Oracle TS do not have separate security and data dictionary. Normally TS cannot be detached from one instance and attached to another. Though, there are special type of TS - transportable tablespace, which can be viewed as being a little bit close to what MS DB is.
Anyway Oracle TS is not even close thing to MS DB.
And it does not need to be. It has a totally different purpose.
also, for each application, i have to create one or more TABLESPACE inside a INSTANCE(that's what i usually do in MS SQL)?You do not have to. But you better to do this way, from a data organization perspective. To make things look nicely organized.
Sometimes one application may use multiple TS, for example when it needs different block size for some tables.
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In Oracle there are no separation between logins and db users. It is one entity - USER. It has its security settings and may have its database objects.
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However when we talk about storage and a place where objects belong to we say SCHEMA.
When we talk about security and an owner where objects belong to - we say USER. :)
Schema is like users Home in OS. What user creates belongs to its "home" - the schema. And the user is owner of it.
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In Oracle there is DB Link which is similar to Linked Server.
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