database examples compatible with sqlite

[barcat.git] / barcat

diff --git a/barcat b/barcat
index edc12bf9303adb754d0995af62501711932c7f7a..7fc7f66ca177ea17fb56c7715d90d66241fe602f 100755 (executable)
--- a/barcat
+++ b/barcat
@@ -650,19 +650,26 @@ Number of HTTP requests per day:
 
     cat httpd/access.log | cut -d\  -f4 | cut -d: -f1 | uniq -c | barcat
 
-Any kind of database query with counts, preserving returned alignment:
+Any kind of database query results, preserving returned alignment:
 
-    echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
+    echo 'SELECT sin(value * .1) FROM generate_series(0, 30) value' |
     psql -t | barcat -u
 
-In PostgreSQL from within the client:
+In PostgreSQL from within the client; a fancy C<\dt+> perhaps:
 
-    > SELECT sin(generate_series(0, 3, .1)) \g |barcat
+    > SELECT schemaname, relname, pg_total_relation_size(relid)
+      FROM pg_statio_user_tables ORDER BY idx_blks_hit
+      \g |barcat -uHf+
+
+Same thing in SQLite (requires the sqlite3 client):
+
+    > .once |barcat -Hf+
+    > SELECT name, sum(pgsize) FROM dbstat GROUP BY 1;
 
 Earthquakes worldwide magnitude 1+ in the last 24 hours:
 
     curl https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.csv |
-    column -tns, | barcat -f4 -u -l80%
+    column -ts, -n | barcat -f4 -u -l80%
 
 External datasets, like movies per year:
 
@@ -689,7 +696,7 @@ Total population history in XML from the World Bank:
 Population and other information for all countries:
 
     curl http://download.geonames.org/export/dump/countryInfo.txt |
-    grep -v '^#\s' | column -tns$'\t' | barcat -f+2 -u -l150 -s
+    grep -v '^#\s' | column -ts$'\t' -n | barcat -f+2 -u -l150 -s
 
 And of course various Git statistics, such commit count by year: