How do I create a polymorphic lookup field in Salesforce?
You cannot create your own polymorphic lookups in Salesforce. You would need to create two separate lookup fields, one to Account and one to Opportunity. You can then, if you wish, use formula fields to pull in data from whichever lookup is populated.
Is SOQL a database?
SOQL is used primarily for querying the Salesforce database and retrieving the records. It does not allow data modifying statements like UPDATE, INSERT, etc. To update or insert multiple records in the Salesforce database, it needs to be done using Salesforce's user interface or DML statements.
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