Add PostViews example query

Author: sbaltes

analysis/bigquery/postviews-example.sql

@@ -0,0 +1,8 @@
+#standardsql
+SELECT pv_outer.*, ViewCount-(
+  SELECT MIN(ViewCount)
+  FROM `sotorrent-org.2019_12_25.PostViews` pv_inner
+  WHERE PostId=3758606) AS ViewCountSince2016_09
+FROM `sotorrent-org.2019_12_25.PostViews` pv_outer
+WHERE PostId=3758606
+ORDER BY Version DESC;