In this post, we have created one custom field Contact size on Account and we will update that contact size field based on insertion/deletion/updating of contact which is related to Account. In other term, we can say Roll-Up Summary through a trigger.
Fun with Trigger -2 | Update Parent field From Child Aggregate (Count/Sum/Avg) when Child record get updated/Created
In this post, we have created one custom field Contact size on Account and we will update that contact size field based on insertion/deletion/updating of contact which is related to Account. In other term, we can say Roll-Up Summary through a trigger.
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 when Child record get updated/Created){kind=link}
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