Data stack exchange: query from all sites
30813
Allow cross-site queries in data explorer
52660
WHERE statement that selects everything (content and NULL)
54096
List of Stack Exchange subdomains that are not mentioned in "All Sites"
48833
Query columns names from a table from another user
16260
Search across Stack Exchange sites in Android app
72135
How to search something on across multiple sites with a single Google query?
62456
What is the REST endpoint URL to get list of site collections?
88284
Is there a way to grant SELECT for every database (including new ones) at a server level?
68003
Seeking country, region, and city data
20138
Allow cross-posting of questions to more than one SO site
96194
Search feature for sites on stackexchange.com
47803
Answering the same question across the site
138305
Automatically suggest asking on another site
4832
List all site collections in SP Online
66300
is there a shorter way to set up queries when filtering results?
49767
Script to query multiple instances
7554
How do I create a cross reference table/query for my data?