Learn about the role of the COMMIT and ROLLBACK commands and how they control the durability of your data.
- Commit and rollback in Oracle…are commands that control the final stake…of transactions done in the database.…A transaction is an autonomous unit of work…where you have modified data.…So for example inserting rows to a table…is considered a transaction because…you have modified rows, however,…at the end of your transaction,…that is, after the last command that you executed…as part of your transaction, say an insert command,…you can choose to either commit the changes,…make them persistent or rollback the changes…which is essentially undoing the changes in your database.…
So for example, if I select all of the rows…from my test table,…I see that I have four rows inserted.…We inserted these rows in our previous video.…However note what happened if I choose to…rollback my transaction.…I got the rollback complete command…from the database and selecting data…from test table will show me an empty table.…
That's because I have rolled-back changes…from my currently active transaction.…I can also make changes persistent…
Note: This training course is appropriate for beginning database developers with no prior experience with SQL or Oracle.
- Using Oracle SQL*Developer, the free development environment
- Selecting data from tables
- Filtering data
- Using functions to manipulate data
- Joining data from tables
- Creating tables
- Updating values
- Truncating data
- Grouping and ordering result sets
- Working with primary keys
- Checking constraints
Skill Level Beginner
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1. Introduction to SQL
2. Preparing the Course Environment
Downloading the course VM2m 16s
3. Using Oracle SQL Developer
4. Basic SELECT Queries
5. String, Number, and Date Functions
6. Joining Table Data
7. Manipulating Data
8. Grouping Data
9. Advanced Topics
Next steps1m 33s
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