Using before update apex trigger how to retrieve values from other object "B" based on year and service type fields on object "A" and update revenue value on Object "A"

Question

I want to retreive value revenue from Object "B" based on input values year and servicetype fields which or common on both objects "A" & "B" and there is no relationship between both objects, and update revenue value on Object "A"

eg: Year 2020, servicetype - gold which are common on both objects

Abhinav Thakur · Answer

Iterate Object A Trigger.old or Trigger.New Value-------> Store common field value in a list-----> Query on object B with common field in where clause with value stored in list.

Using before update apex trigger how to retrieve values from other object "B" based on year and service type fields on object "A" and update revenue value on Object "A"

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