Uniqueness

In Epicollect5 there are two distinct types of uniqueness:
Form: uniqueness is across all the entries of a form
Hierarchy: uniqueness is across all the child entries of a form (the parent entry is considered)
If your project has got a single form only, the uniqueness is always set to form. This means if you set a question like "What is your name" as unique, you cannot have the same name more than once.
The comparison is case insensitive i.e. "John" and "john" are the same, despite the capital letter of "John".
If you have multiple forms, for each child form you have the option to decide if you want the answer to the question unique form wide or hierarchy wide. On a project featuring UNIVERSITY as the parent form, and DEPARTMENT as the child form, let's imagine you enter "Imperial College" as a UNIVERSITY entry and then you add DEPARTMENT entries to it, like Biology, History, Media etc.
If you would like to avoid having the same department entered more than once for a single UNIVERSITY entry, you might set the uniqueness on the DEPARTMENT name. If you set DEPARTMENT name to be unique as form though, you could enter "Biology" only once, regardless of the UNIVERSITY being Imperial College or another one, like Stanford. This would not work as "Biology" is a common department across universities in the world.
Form uniqueness:
The solution is to set the uniqueness as hierarchy, to have the parent entry considered. This way the "Biology" DEPARTMENT can be entered only once but for each UNIVERSITY entry.
Hierarchy uniqueness:
To set the uniqueness for a question, select the question and go to the "Advanced" tab:
The first option is the form uniqueness, the second option is the hierarchy uniqueness as described.
The form(s) names will be different based on your project form names.
The uniqueness constraint is available for the following question types:
TEXT
NUMERIC
PHONE
DATE
TIME
TEXTBOX
BARCODE
Date & Time uniqueness
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The uniqueness of DATE and TIME questions is based on the format selected. 
DATE answers are saved in ISO 8601 format, without timezone and with the time set to midnight, i.e `2022-01-15T00:00:00.000` therefore the comparison is done only one the date part.
dd/MM/YYY
same day, month and year
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MM/dd/YYYY
same day, month and year
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YYYY/MM/dd
same day, month and year
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MM/YYYY
same month and year, day not considered
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dd/MM
same day and month, year not considered
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TIME answers are saved in ISO 8601 format i.e 2022-05-12T12:34:45.000but the date part is not considered for the uniqueness.
HH:mm:ss
same hours, minutes and seconds
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hh:mm:ss
same hours, minutes and seconds
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HH:mm
same hours and minutes, any seconds
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hh:mm
same hours and minutes, any seconds
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mm:ss
same minutes and seconds, any hour
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Date & Time uniqueness