Essentially the system works the same way as you'd expect in a programming language: an empty string is not the same as a null value, it is still an instance of a string. The link to the Blog in the original question on Salesforce Interview Questions is broken, so we don't know the context.
For that reason I'm going to add an update that goes beyond the answers provided. See the following references in the Apex Documentation for the String Class. Instead, IsEmpty is used for sets, lists or maps with zero elements.
You'll only see isNull used in Formulas. In checking the documentation , you'll find the following:. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Learn more. Asked 8 years, 8 months ago. Active 1 year, 6 months ago. If so, a 0 is counted for that field. Note that above formula requires you select the Treat blank fields as blanks option under Blank Field Handling while the Advanced Formula subtab is showing.
Multi select picklist fields are never null in s-controls which are deprecated, buttons, and email templates, so using ISNULL function with a multi select picklist field in those contexts always returns false. Choose Treat blank fields as blanks for your formula when referencing a number field, percent field, or currency field in an ISNULL function. Choosing Treat blank fields as 0s gives blank fields the value of 0 so none of them will be null. Merge fields can be handled as blanks, which can affect the results of components like s-controls which are deprecated because they can call ISNULL function.
If you have any questions, comments etc. As always, please feel free to get in touch me as I would be more than happy to assist you with any of your Salesforce development needs. Email This BlogThis! Improve this question. NullUserException Sitansu Sitansu 3, 7 7 gold badges 30 30 silver badges 58 58 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Artyom Sokolov Artyom Sokolov 2, 3 3 gold badges 23 23 silver badges 34 34 bronze badges.
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