How can I write a trigger in Oracle 8? I keep getting a mutating table error. I need to use a SQL query on the...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
table for which I'm writting this trigger.
You can write a trigger which queries the table that forced the trigger to fire. So that part is not a problem. You get a Mutating table error when you attempt to modify the table that caused the trigger to fire. What happens is a change (insert/update/delete) occurs on that table. So a trigger gets fired. In that trigger, you perform a change on that table. The trigger will want to fire again. But the system detects that the change is caused by the trigger itself, not something else. This is called a mutating table error. So don't modify the table in the table's trigger and you won't see this error.
For More Information
- What do you think about this answer? E-mail the editors at editor@searchDatabase.com with your feedback.
- The Best Oracle Web Links: tips, tutorials, scripts, and more.
- Have an Oracle or SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical Oracle and SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.
Dig Deeper on Oracle database design and architecture
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.