Learn about the core concepts of database transactions that control how data is stored in your Oracle database, how to make DML changes persistent using the COMMIT command and when changes can be rolled back using the ROLLBACK command.
- [Instructor] In our previous video,…we saw how we can use the Oracle commit and rollback…commands to control the end state of transactions.…Either make the changes persistent, using commit,…or rollback the changes, undo the changes,…using the rollback command.…As we've mentioned, commit and rollback…control the end states of transactions.…Let's explore transactions in greater details.…A transaction is an autonomous unit of work in Oracle,…where data is modified.…
For example, when you run insert,…update, or delete commands,…that is, DML commands,…you run them inside a transaction.…When you connect to the Oracle database,…and run your first DML command,…a transaction will be implicitly created,…and the transaction will be closed…when you either issue a commit, or rollback, command.…So for example, typing:…insert into test_table1…values ('hello',1)…and running this insert command will essentially…open a new transaction in the database.…
Any subsequent insert commands that we will issue,…will all be part of the same transaction.…
Author
David Yahalom
Released
1/17/2018Note: 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
Duration
Views
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Introduction
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Welcome1m 37s
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1. Introduction to SQL
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What is SQL?2m 30s
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Database tables2m 21s
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Overview of table data types4m 21s
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SQL query structure4m 38s
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2. Preparing the Course Environment
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Downloading the course VM2m 16s
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3. Using Oracle SQL Developer
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Exploring database objects1m 29s
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Filtering specific objects1m 25s
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Using SQL Developer tabs2m 18s
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Viewing query output1m 18s
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4. Basic SELECT Queries
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Using WHERE to filter dates2m 42s
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Using column aliases2m 18s
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Using ORDER BY3m 29s
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5. String, Number, and Date Functions
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Introduction to functions1m 39s
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Using LENGTH1m 4s
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Using CONCAT4m 48s
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Using LOWER and UPPER2m 44s
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Using INSTR4m 32s
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Using RPAD and LPAD3m 31s
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Using ROUND1m 15s
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Using TRUNC1m 36s
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Using SYSDATE1m 59s
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Using SYSTIMESTAMP1m 37s
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Using MONTHS_BETWEEN3m 2s
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Using ADD_MONTHS1m 17s
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6. Joining Table Data
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Joining data from tables4m 12s
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INNER JOIN1m 17s
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LEFT JOIN2m 55s
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RIGHT JOIN1m 55s
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FULL OUTER JOIN1m 59s
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7. Manipulating Data
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Creating a simple table2m 1s
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COMMIT and ROLLBACK2m 23s
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Introduction to transactions3m 43s
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Deleting rows for a table3m 23s
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Updating values2m 40s
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8. Grouping Data
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Using aggregate functions2m 24s
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Using GROUP BY2m 45s
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Using HAVING3m
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9. Advanced Topics
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Primary keys2m 47s
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NOT NULL constraints1m 36s
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Check constraints3m 2s
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Foreign key constraints6m 4s
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Subqueries4m 39s
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Conclusion
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Next steps1m 33s
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Video: Introduction to transactions