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Exam Code: | PDI |
Exam Name: | Platform Developer I (PDI) |
Certification Provider: | Salesforce |
Free Question Number: | 54 |
Version: | v2021-06-20 |
Rating: | |
# of views: | 11244 |
# of Questions views: | 346258 |
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No.# BDE correct
No.# A is correct
No.# C correct
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No.# I think A is a correct answer.
reference: https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_quick_start_display_field_values.htm
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No.# Ans is C. SELECT ID FROM Trainer_c WHERE Gym__r.Name = ‘Viridian City Gym’
Explanation:
Since Trainer_c has a lookup field to Gym_c, we can traverse the relationship to get the Gym_c record and filter it by the Name field to get the record for the Viridian City gym. Then, we can use the child relationship name "Gym__r" to access the related Trainer_c records.
Option A is incorrect because it uses the wrong child relationship name ("Trainers__r") for the Trainer_c object.
Option B is incorrect because it incorrectly queries the child object's records first, rather than the parent object's record.
Option D is incorrect because it uses the wrong child relationship name ("Trainers__c") for the Trainer_c object.
No.# I see the confusion between the C and D as answers. Actually, C would have been the perfect answer if the later part of the reason is modified in this manner - and the child (which in this case is the line item) can be re-parented. There is a field called Allow reparenting in Fields and Relationships that allows for a master (in a master-detail relationship) to allow a child to be re-parented.
No.# we use __r instead of __r because Trainers__c and Gym__c are related to eachother and you're trying to fetch Trainers__c from Gym__c
No.# Anwer is :D check this code in your developer console
No.# must be Master detail to use roll up summary to have te total amont :)
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No.# SELECT id, (SELECT id FROM Trainers__r) FROM Gym __c WHERE NAME ='Viridian City gym'
No.# A, D, E.