Some useful SQL queries

sql.md

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+
+# Most common servers
+
+```SQL
+SELECT COUNT(*), host FROM followers GROUP BY host ORDER BY count DESC;
+```
+
+# Most popular twitter users
+
+```SQL
+SELECT COUNT(*), acct FROM (SELECT unnest(followings) as follow FROM followers) AS f INNER JOIN twitter_users ON f.follow=twitter_users.id GROUP BY acct ORDER BY count DESC;
+```
+
+# Most active users
+
+```SQL
+SELECT array_length(followings, 1) AS l, acct, host FROM followers ORDER BY l DESC;
+```
+
+# Lag
+
+```SQL
+SELECT COUNT(*), date_trunc('day', lastsync) FROM (SELECT unnest(followings) as follow FROM followers GROUP BY follow) AS f INNER JOIN twitter_users ON f.follow=twitter_users.id GROUP BY date_trunc;
+```