How to Search for a Null Value: Difference between revisions
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m (Mtulig moved page How to search for a null value to How to Search for a Null Value without leaving a redirect) |
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Revision as of 19:46, 21 July 2015
It is not uncommon to want to search for records with nothing in a particular field. Which search string you use will depend on what it is that you don’t want to find. In EMu, the exclamation mark specifies NOT. Thus:
!+ in an attachment field will return all records where there is no attachment in that field.
!* in any field will return records where there is no value in a field.
Keep in mind that these searches take longer than searches using complete words.
Example
Find all Lecythis specimens without images: