How Roll back works

Question

The User is doing below steps:
1) Creating one table with the table name as Temp.
2) Creating table as ABC.
3) Inserting 10 rows in the Temp table.
4) selectin * from Temp
5) Deleting 5 rows from Temp table
6) Rollback.
Will it rollback all of the steps done i.e from 1-6.
Or will it roll back only the 6th Step.
Please help me getting solution as i am unable to undersand it.
As per me only the last step should be rolledback.

Answer 1

Let's make it clear...
DML = Data Manipulation Language
This consists of INSERT, UPDATE and DELETE. Also SELECT gets put into this category even though it is not really manipulating the data on the database.
DDL = Data Definition Language
Essentially, any database defining statement that is not DML.
DDL statements automatically issue a "commit" before and after they execute.
Transactions on a database are defined as what occurs between one commit and another.
A Rollback statement will roll back any statements in the current transaction.
Therefore if you issue DDL statements you are causing a commit to occur on the database so any subsequent rollback statement will only roll back to the point of the last commit (i.e. just after the last DDL statement or after the last explicit commit)
1. create table ....                    <--- DDL (implicit) commit
2. create table ....                    <--- DDL (implicit) commit
3. insert into ....                     <--- DML (first statement in transaction)
4. select ....                          <--- DML (second statement in transaction)
5. delete from ....                     <--- DML (third statement in transaction)
6. Rollback                             <--- Rolls back the transaction i.e. everything back to 3