add example sql

example.sql

@@ -0,0 +1,6 @@
+-- Insert a tag if it got missed
+--INSERT INTO tags_map (transaction_id, tag_id) VALUES(2247, 11);
+SELECT * FROM transactions t
+	JOIN tags_map ON (transaction_id = t.id)
+	JOIN tags tg ON (tag_id = tg.id)
+	WHERE transaction_id = 2247;