- What is the difference between after trigger and instead of trigger in SQL Server?
- What is difference between trigger new and trigger old?
- Do triggers slow down database?
- Can triggers be created on views?
- What is instead of trigger?
- In which object would the after trigger in SQL Server be applied?
- Can we call Queueable from future method?
- What are the different types of trigger?
- Can we call trigger manually?
- What is before trigger and after trigger?
- Can a trigger call another trigger?
- Can we call batch from future method?
- Can we call future method from future method?
- What is inserted in trigger?
- Can we call batch class from trigger?
- What command is used to removing trigger?
- Which is the correct syntax to delete trigger?
- What is Pragma Autonomous_transaction in trigger?
What is the difference between after trigger and instead of trigger in SQL Server?
AFTER trigger fires after a DML operation.
INSTEAD OF trigger fires instead of a DML operation.
INSTEAD OF allows you to override functionality, or implement functionality that otherwise isn’t supported..
What is difference between trigger new and trigger old?
new : Returns a list of the new versions of the sObject records. Note that this sObject list is only available in insert and update triggers, and the records can only be modified in before triggers. Trigger. old : Returns a list of the old versions of the sObject records.
Do triggers slow down database?
A trigger fires inside the transaction that modifies the data in the table. … The triggers of this type will not slow down operations, however, will ensure data coupling and integrity.
Can triggers be created on views?
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 is instead of trigger?
What is an INSTEAD OF trigger. An INSTEAD OF trigger is a trigger that allows you to skip an INSERT , DELETE , or UPDATE statement to a table or a view and execute other statements defined in the trigger instead. … In other words, an INSTEAD OF trigger skips a DML statement and execute other statements.
In which object would the after trigger in SQL Server be applied?
Explanation: AFTER trigger fires after SQL Server completes the execution of the action successfully that fired it. Explanation: In SQL Server we can create triggers on DML statements (like INSERT, UPDATE, and DELETE) and stored procedures that perform DML-like operations.
Can we call Queueable from future method?
You can pass Array of objects to Queueable interface, but in future method it is not supported. You can chain the jobs in the Queueable only. … In execution cycle, you cannot call from one future method to another future method. Its achieved inqueueable class by using the Chaining Jobs.
What are the different types of trigger?
Types of TriggersData Manipulation Language (DML) Triggers. DML triggers are executed when a DML operation like INSERT, UPDATE OR DELETE is fired on a Table or View. … Data Definition Language (DDL) Triggers. … LOGON Triggers. … CLR Triggers.
Can we call trigger manually?
By definition “a trigger” is a procedure that fires when a table is changed. … You cannot call triggers directly. They are fired automatically when you perform an insert/update or delete on a table that has triggers. Therefore, you cannot call a trigger in a stored procedure.
What is before trigger and after trigger?
Before triggers are used to update or validate record values before they’re saved to the database. After triggers are used to access field values that are set by the system (such as a record’s Id or LastModifiedDate field), and to affect changes in other records. The records that fire the after trigger are read-only.
Can a trigger call another trigger?
Both DML and DDL triggers are nested when a trigger performs an action that initiates another trigger. These actions can initiate other triggers, and so on. DML and DDL triggers can be nested up to 32 levels. You can control whether AFTER triggers can be nested through the nested triggers server configuration option.
Can we call batch from future method?
A future method runs in the background, asynchronously. You can call a future method for executing long-running operations, such as callouts to external Web services or any operation you’d like to run in its own thread, on its own time. Yes, we can’t call future method from batch class.
Can we call future method from future method?
You cannot call a future method from another future method as both them are asynchronous. In salesforce you cannot call one asynchronous function into another asynchronous method. You cannot call a method annotated with future from a method that also has the future annotation.
What is inserted in trigger?
The inserted table stores copies of the affected rows during INSERT and UPDATE statements. During an insert or update transaction, new rows are added to both the inserted table and the trigger table. The rows in the inserted table are copies of the new rows in the trigger table.
Can we call batch class from trigger?
Yes it is possible, we can call a batch apex from trigger but we should always keep in mind that we should not call batch apex from trigger each time as this will exceeds the governor limit this is because of the reason that we can only have 5 apex jobs queued or executing at a time.
What command is used to removing trigger?
Use the DROP TRIGGER statement to remove a database trigger from the database.
Which is the correct syntax to delete trigger?
To remove a LOGON event trigger, you use the following syntax: DROP TRIGGER [ IF EXISTS ] trigger_name [ ,…n ] ON ALL SERVER; Notice that when you drop a table, all triggers associated with the table are also removed automatically.
What is Pragma Autonomous_transaction in trigger?
The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction.