I am trying to find the unused methods using the Query Editor in Developer Console.

I have checked Use Tooling API.

Running SOQL like below:

SELECT Id FROM SymbolTable WHERE externalReferences = NULL

But getting this error:

SELECT Id FROM SymbolTable WHERE externalReferences
ERROR at Row:1:Column:16
sObject type 'SymbolTable' is not supported. If you are attempting to use a custom object, be sure to append the '__c' after the entity name. Please reference your WSDL or the describe call for the appropriate names.

What I am missing here?


You need to query the field from the ApexClass object first, as seen here



If there is not a cached version of SymbolTable, it will be compiled in the background and the query might take longer than expected. The SymbolTable returned from ApexClass does not contain references; to retrieve a SymbolTable with references, use ApexClassMember.

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