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...
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.