Cross-site SEDE Queries
30813
Allow cross-site queries in data explorer
97199
The ability to link cross-site duplicates
122242
Is it possible using the SE API to get a list of another user's posts that I have upvoted?
75313
Have search engines recognise multi-lingual sites
143725
How to search multiple sites at once?
96194
Search feature for sites on stackexchange.com
39363
Please provide the ability to cross post questions to multiple Stack Exchange communities
3022
A query that lists all mapped users for a given login
125294
Select Query on 2 tables, on different database servers
74632
Query without having to specify table's schema
104969
Running queries to StackExchange Data Explorer from anywhere
92109
Searching my own questions & answers over all Stack Exchange sites
77231
Span Stack Exchange sites for tags, searches, and related questions
21238
Is there a way to search all sites at once?
153403
Don't include SE site in SE search filter?
151846
How do you search for questions filtered by a particular user?
110206
Overlapping text in Database Schema SEDE