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Trigger doubt

I created student custom object and lookup relation with account object.

I created one custom field(No of student records) in account object.

when ever i created record or deleting record the custom field in account object  should update..

How to write trigger...

 

 

If it is possible please write the comments of that trigger why we r writing that line...

 

Tim BarsottiTim Barsotti

This could be done via triggers. However, it could also be done if you change the relationship to Master-Detail and then have a roll-up summary field on the account object.