Finnish WLM new users who continued editing 2017.

SQL

use commonswiki_p;
select 
	page_title, 
    page_namespace, 
    user_registration, 
    max(rev_timestamp) as max_ts, 
    min(rev_timestamp) as min_ts, 
    rev_user_text  
FROM 
	page, 
    categorylinks, 
    image, 
    user, 
    revision_userindex 
WHERE rev_user_text=user_name 
	and rev_user >0 
    and user_id=img_user 
    and img_name=page_title 
    and page_id=cl_from 
    and cl_to = "Images_from_Wiki_Loves_Monuments_2017_in_Finland" 
    and page_namespace=6 
    and user_registration > 20170900151240 
GROUP BY rev_user_text
UNION
select 
	page_title, 
    page_namespace, 
    user_registration, 
    max(rev_timestamp) as max_ts, 
    min(rev_timestamp) as min_ts, 
    rev_user_text  
FROM 
	page, 
    categorylinks, 
    image, 
    user, 
    fiwiki_p.revision_userindex 
WHERE rev_user_text=user_name 
	and rev_user >0 
    and user_id=img_user 
    and img_name=page_title 
    and page_id=cl_from 
    and cl_to = "Images_from_Wiki_Loves_Monuments_2017_in_Finland" 
    and page_namespace=6 
    and user_registration > 20170900151240
UNION
select 
	page_title, 
    page_namespace, 
    user_registration, 
    max(rev_timestamp) as max_ts, 
    min(rev_timestamp) as min_ts, 
    rev_user_text  
FROM 
	page, 
    categorylinks, 
    image, 
    user, 
    fiwiki_p.revision_userindex 
WHERE rev_user_text=user_name 
	and rev_user >0 
    and user_id=img_user 
    and img_name=page_title 
    and page_id=cl_from 
    and cl_to = "Images_from_Wiki_Loves_Monuments_2017_in_Finland" 
    and page_namespace=6 
    and user_registration > 20170900151240 
group by user_name    
UNION
select 
	page_title, 
    page_namespace, 
    user_registration, 
    max(rev_timestamp) as max_ts, 
    min(rev_timestamp) as min_ts, 
    rev_user_text  
FROM 
	page, 
    categorylinks, 
    image, 
    user, 
    enwiki_p.revision_userindex 
WHERE rev_user_text=user_name 
	and rev_user >0 
    and user_id=img_user 
    and img_name=page_title 
    and page_id=cl_from 
    and cl_to = "Images_from_Wiki_Loves_Monuments_2017_in_Finland" 
    and page_namespace=6 
    and user_registration > 20170900151240 
group by user_name     
UNION
select 
	page_title, 
    page_namespace, 
    user_registration, 
    max(rev_timestamp) as max_ts, 
    min(rev_timestamp) as min_ts, 
    rev_user_text  
FROM 
	page, 
    categorylinks, 
    image, 
    user, 
    svwiki_p.revision_userindex 
WHERE rev_user_text=user_name 
	and rev_user >0 
    and user_id=img_user 
    and img_name=page_title 
    and page_id=cl_from 
    and cl_to = "Images_from_Wiki_Loves_Monuments_2017_in_Finland" 
    and page_namespace=6 
    and user_registration > 20170900151240 
group by user_name
SQL

Checking query status...
