Q&A

How can we create a schema trigger?

Cairon Davison

How can we create a schema trigger?

To create a trigger in your own schema on a table in your own schema or on your own schema ( SCHEMA ), you must have the CREATE TRIGGER system privilege. To create a trigger in any schema on a table in any schema, or on another user’s schema ( schema . SCHEMA ), you must have the CREATE ANY TRIGGER system privilege.

How can we create a schema trigger in Oracle?

How to create a trigger in Oracle

  1. 1) CREATE OR REPLACE. The CREATE keyword specifies that you are creating a new trigger.
  2. 2) Trigger name.
  3. 3) BEFORE | AFTER.
  4. 4) ON table_name.
  5. 5) FOR EACH ROW.
  6. 6) ENABLE / DISABLE.
  7. 7) FOLLOWS | PRECEDES another_trigger.

How do I add a trigger to a table in SQL?

Creating Triggers

  1. CREATE [OR REPLACE] TRIGGER trigger_name − Creates or replaces an existing trigger with the trigger_name.
  2. {BEFORE | AFTER | INSTEAD OF} − This specifies when the trigger will be executed.
  3. {INSERT [OR] | UPDATE [OR] | DELETE} − This specifies the DML operation.

Can we create table in trigger?

Triggers are associated with the table or view directly. Triggers are database operations that are automatically fired when an action such as Insert/Update/Delete is performed on a table or a View in a database.

What is schema trigger?

You can define triggers for the same event (such as SERVERERROR) on both the schema and database levels. Oracle fires the trigger whenever a DROP statement removes an existing database object from the schema. ALTER. Oracle fires the trigger whenever an ALTER statement modifies an existing database object in the schema.

What are the different types of triggers?

Types of Triggers

  • Row Triggers and Statement Triggers.
  • BEFORE and AFTER Triggers.
  • INSTEAD OF Triggers.
  • Triggers on System Events and User Events.

How do I create a valid 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.

Can a trigger be created on a view?

Triggers may be created on views, as well as ordinary tables, by specifying INSTEAD OF in the CREATE TRIGGER statement. If one or more ON INSERT, ON DELETE or ON UPDATE triggers are defined on a view, then it is not an error to execute an INSERT, DELETE or UPDATE statement on the view, respectively.

What are the different in trigger?

A trigger has three basic parts: A triggering event or statement. A trigger restriction. A trigger action.

How do I create a trigger in a schema?

To create a trigger in your schema on a table in your schema or on your schema ( SCHEMA ), you must have the CREATE TRIGGER system privilege. To create a trigger in any schema on a table in any schema, or on another user’s schema ( schema. SCHEMA ), you must have the CREATE ANY TRIGGER system privilege.

What is create Trigger in SQL Server?

CREATE TRIGGER must be the first statement in the batch and can apply to only one table. A trigger is created only in the current database; however, a trigger can reference objects outside the current database. If the trigger schema name is specified to qualify the trigger, qualify the table name in the same way.

How do I create a trigger on a pluggable database?

To create a trigger on a pluggable database (PDB), you must be connected to that PDB and have the ADMINISTER DATABASE TRIGGER system privilege. For information about PDBs, see Oracle Database Administrator’s Guide. In addition to the preceding privileges, to create a crossedition trigger, you must be enabled for editions.

Can I create a user-defined trigger on a system table?

Because SQL Server does not support user-defined triggers on system tables, we recommend that you do not create user-defined triggers on system tables. Triggers work in transactions (implied or otherwise) and while they’re open, they lock resources.