Can we update same table in trigger Oracle?

Can we update same table in trigger Oracle?

You can update another column of updating the same table.

How do I create a trigger after insert and update in Oracle?

Oracle After INSERT/UPDATE/DELETE Trigger

1. CREATE [ OR REPLACE ] TRIGGER trigger_name.
2. AFTER INSERT or UPDATE or DELETE.
3. ON table_name.
4. [ FOR EACH ROW ]
5. DECLARE.
6. — variable declarations.
7. BEGIN.
8. — trigger code.

Should be used when a triggering statement affects rows in a table but the processing required is completely independent of the number of rows affected?

Define Statement level triggers. It is fired when statement affects rows in a table but the processing required is completely independent of the number of rows affected.

Is mutating trigger function may not see it?

The Oracle mutating trigger error occurs when a trigger references the table that owns the trigger, resulting in the “ORA-04091: table name is mutating, trigger/function may not see it.” message. Don’t use triggers – The best way to avoid the mutating table error is not to use triggers.

What is compound trigger in Oracle?

Oracle 11g offers a new twist on triggers–the compound trigger–a trigger that can act both before and after an update, insert or delete has occurred. Compound triggers can be used to avoid the dreaded mutating table error or to process and accept or reject updates to a table based upon desired criteria.

Can’t update table in stored function trigger because it is already used by statement?

You cannot change a table while the INSERT trigger is firing. The INSERT might do some locking which could result in a deadlock. Also, updating the table from a trigger would then cause the same trigger to fire again in an infinite recursive loop. Both of these reasons are why MySQL prevents you from doing this.

How do you modify an existing trigger in Oracle?

If you omit schema , then Oracle Database assumes the trigger is in your own schema. Specify the name of the trigger to be altered. Specify ENABLE to enable the trigger. You can also use the ENABLE ALL TRIGGERS clause of ALTER TABLE to enable all triggers associated with a table.

How can we specifies a row level trigger?

Row-level trigger is identified by the FOR EACH ROW clause in the CREATE TRIGGER command. Statement-level triggers execute once for each transaction. For example, if a single transaction inserted 500 rows into the Customer table, then a statement-level trigger on that table would only be executed once.

Can you call a stored procedure from a trigger?

A: Yes, we can call stored procedure inside the trigger. For example: Create PROCEDURE [dbo].

What happens if a trigger fails in Oracle?

Statements are atomic in Oracle (as they should be in all databases). So, after your insert, if the trigger failed – the database will look like your insert never ever happened.

How to update after insert in the same table in Oracle trigger?

You don’t (and can’t, generally) update the row you’re inserting; you need to change what is being inserted by setting the new Z value for the current row: This refers to the inserted/updated row using the :new pseudorecord syntax.

How to use compound trigger in Oracle SQL?

Trigger dropped. Package created. The basic idea with this pre-11.1 and compound trigger solution is to build a package that relies on a global array to keep track of rows modified, then provide a procedure to execute at the statement level (at which point mutating table errors do not occur).

How to query and execute trigger on the same table?

If you have several rows with the same filing_id then you can overwork you database design. Maybe you really only check against the own table in which case you can use :old. But when you have several rows to check (which I assume because you make a count) then you have to use two tables.