Docs + example of canned SQL query using || concatenation

Closes #321

tests/fixtures.py

@@ -143,7 +143,14 @@ METADATA = {
                 },
             },
             'queries': {
-                'pragma_cache_size': 'PRAGMA cache_size;'
+                'pragma_cache_size': 'PRAGMA cache_size;',
+                'neighborhood_search': '''
+                    select neighborhood, facet_cities.name, state
+                    from facetable
+                        join facet_cities on facetable.city_id = facet_cities.id
+                    where neighborhood like '%' || :text || '%'
+                    order by neighborhood;
+                '''
             }
         },
     }