Trigger Syntax

trigger TriggerName on ObjectName (trigger_events) {
                     code_block
                     }

The trigger_events placeholder can be a comma-separated list of one or more of the following events:

For example, the following code defines a trigger for the before insert and before update events on the Account object:

trigger myAccountTrigger on Account (before insert, before update) {
    // Your code here
}

The code block of a trigger cannot contain the static keyword. Triggers can only contain keywords applicable to an inner class. In addition, you do not have to manually commit any database changes made by a trigger. If your Apex trigger completes successfully, any database changes are automatically committed. If your Apex trigger does not complete successfully, any changes made to the database are rolled back.