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Making fields external IDs

Is there a way to make a Long Area Text field and a picklist field External IDs? The reason why I want to make them external IDs is so that it would become searchable. 


Thanks in advance for your help. 




You can make external id field only for text, number and email not for Long Text area field


In case you want the Long text area field as searchable, You can write a before insert or before update trigger to update the value of long text area field from the TEXT AREA FIELD, So that the long text area field is searchable





so i would have to write a trigger that typecasts the text field? if so, what i change it to?