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Wei Cheng Hsu 9 get parent values inside a set
Account has a field `Source_System__c` as its parent.
I wanna query Name, Id from Source_System
This query is workable.
[SELECT Source_System__r.Name, Source_System__r.Id from Account]
However, I wanna have the value from Source_System can be nested in a object.
Like the sub-query's result. But it didn't work.
SELECT (SELECT Name, Id from Source_System) FROM Account
^
ERROR at Row:1:Column:30
Didn't understand relationship 'Source_System' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names.
SELECT (SELECT Name, Id from Source_System__r) FROM Account
^
ERROR at Row:1:Column:30
Didn't understand relationship 'Source_System__r' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names.
I wanna query Name, Id from Source_System
This query is workable.
[SELECT Source_System__r.Name, Source_System__r.Id from Account]
However, I wanna have the value from Source_System can be nested in a object.
Like the sub-query's result. But it didn't work.
SELECT (SELECT Name, Id from Source_System) FROM Account
^
ERROR at Row:1:Column:30
Didn't understand relationship 'Source_System' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names.
SELECT (SELECT Name, Id from Source_System__r) FROM Account
^
ERROR at Row:1:Column:30
Didn't understand relationship 'Source_System__r' in FROM part of query call. If you are attempting to use a custom relationship, be sure to append the '__r' after the custom relationship name. Please reference your WSDL or the describe call for the appropriate names.
Source_System__c is a parent object and Account is a child object.
If you want to query on child object use :
[SELECT (SELECT Name, Id from Account) FROM Source_System__c]
If you want to query on parent object use :
[SELECT Source_System__r.Name, Source_System__r.Id from Account]
Thanks
Ankur Saini
Try this
[SELECT Id, Account.Name, Account.Description FROM Contact ]
for more details check : Simple Guidance For You In Access Of Subquery Field Value Using Apex - Upwards Traversal (http://howtodoitinsalesforce.blogspot.in/2016/12/access-subquery-field-value-using-apex_4.html)
For nested query you have to use the plural version “Contacts” in the nested SOQL query. Find the keyword of a custom relationship from the lookup or master-detail field.
Traversing from parent to Child we say it as Downwards traversal, then use :
[select id, Name, (select id, Name, Email from Contacts) from Accoun]
for more details check : Access Subquery Field Value Using Apex in 2 Easy Steps- Downwards Traversal (http://howtodoitinsalesforce.blogspot.in/2016/12/access-subquery-field-value-using-apex.htm)
Please mark as best answer if it works for you.
Thanks,
Nitish