• In actions reports, Unique visitors should always be displayed for "day" period. Unique cannot be processed for other periods (or date ranges). If the data is in the API and not displayed in the UI, can you give specific examples?
• displaying unique visitors for Custom Variables is covered in UNIQUE VISITORS for custom variables #5109

• please can you post example from the API maybe on demo?

@peterbo feel free to re-open a new issue if you still experience something like this in 2.9.1

btw default for processing uniques are set here: https://github.com/piwik/piwik/blob/master/config/global.ini.php#L126-L131

we are facing the same issue with piwiki 2.9.1
#6810

http://IP/piwik/index.php?module=API&method=API.get&format=XML&idSite=8&period=week&date=2014-12-01,2014-12-07&expanded=1&token_auth=TOKEN&filter_limit=26

Hi @YehiaAboSedera so you are seeing nb_uniq_visitors in the API response but it is not displayed in the interface, is it correct?

@mattab yes exactly

Moved to 2.11.0 milestone

I have no idea what is do be done here. Where in the interface is it missing? I can see it when going to "Visitors => Overview" which is basically the API.get visualization of the above image / API response.

Custom Variables is handled in a different issue as mentioned so wondering what to do here.

Hi @YehiaAboSedera @peterbo please comment here and reopen issue if you still experience this in 2.10.0

Closing as it works for us

I found what cause this error:
you count unique visitors on this way:

SELECT count(distinct idvisitor) FROM piwik.log_visit_table
where visit_field > '2015-02-01' and visit_field < '2015-03-01'
AND ( v1 = 'Ext' OR v1 = 'Int' );
(I changed key names for security reason)
and when user is in both groups, Int and Ext
you loose one Unique Visits

so, you need to count this:
SELECT count(distinct idvisitor, v1) FROM piwik.log_visit_table
where visit_field > '2015-02-01' and visit_field < '2015-03-01'
AND ( v1 = 'Ext' OR v1 = 'Int' );

Can you post the proper field names? It is not a security problem since they are public here in the source code

in LogAgregator
Metrics::INDEX_NB_UNIQ_VISITORS => "count(distinct " . self::LOG_VISIT_TABLE . ".idvisitor)",
change to
Metrics::INDEX_NB_UNIQ_VISITORS => "count(distinct " . self::LOG_VISIT_TABLE . ".idvisitor, " . self::LOG_VISIT_TABLE . ".custom_var_v1)",

This looks like custom logic to me but I it can make sense. I reckon it depends on the kind of application and what custom variables are used for. If I understand it correctly, you do want to count two unique visitors in case there is one visitor having two entries each with a different custom variable? @mattab ?

@milantestagena can you create a new issue explaining what you are doing and what you would ideally need us to do? this issue is closed already

Even After updating Metrics::INDEX_NB_UNIQ_VISITORS => "count(distinct " . self::LOG_VISIT_TABLE . ".idvisitor, " . self::LOG_VISIT_TABLE . ".custom_var_v1)" in LogAgregator, Unique visitors count showing blank for custom variables in piwik.
I enabled unique visitor in piwik based on http://piwik.org/faq/how-to/#faq_113