feat: add bin/route-count.sh and bin/trip-count.sh

bin/route-count.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+echo "Started..."
+#Started...
+#
+# special variable $# is the number of arguments
+if [ $# -lt 3 ] ; then
+    echo 'Call ./<script> <db name> <db user> <db schema>'
+    exit 1
+fi
+#
+DB_NAME="$1"
+echo "DB_NAME: ${DB_NAME}"
+DB_USER="$2"
+echo "DB_USER: ${DB_USER}"
+DB_SCHEMA="$3"
+echo "DB_SCHEMA: ${DB_SCHEMA}"
+#
+psql -h localhost -p 5432 -U $DB_USER -f ./sql/route-count.sql -d $DB_NAME -v schema=$DB_SCHEMA
+#
+echo "Done."
+#done.

bin/trip-count.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+echo "Started..."
+#Started...
+#
+# special variable $# is the number of arguments
+if [ $# -lt 3 ] ; then
+    echo 'Call ./<script> <db name> <db user> <db schema>'
+    exit 1
+fi
+#
+DB_NAME="$1"
+echo "DB_NAME: ${DB_NAME}"
+DB_USER="$2"
+echo "DB_USER: ${DB_USER}"
+DB_SCHEMA="$3"
+echo "DB_SCHEMA: ${DB_SCHEMA}"
+#
+psql -h localhost -p 5432 -U $DB_USER -f ./sql/trip-count.sql -d $DB_NAME -v schema=$DB_SCHEMA
+#
+echo "Done."
+#done.

sql/route-count.sql

@@ -0,0 +1,8 @@
+-- colon before variable: for a prepared statement using named placeholders, this will be a parameter name of the form :name
+
+CREATE SCHEMA IF NOT EXISTS :schema;
+SET search_path to :schema, public;
+
+---create view
+CREATE OR REPLACE VIEW :schema.vw_route_count AS
+SELECT count(DISTINCT rts.route_id) AS route_count, rts.agency_id, gncy.agency_name FROM :schema.routes AS rts LEFT JOIN :schema.agency AS gncy ON rts.agency_id = gncy.agency_id GROUP BY rts.agency_id, gncy.agency_name ORDER BY route_count DESC;

sql/trip-count.sql

@@ -0,0 +1,8 @@
+-- colon before variable: for a prepared statement using named placeholders, this will be a parameter name of the form :name
+
+CREATE SCHEMA IF NOT EXISTS :schema;
+SET search_path to :schema, public;
+
+---create view
+CREATE OR REPLACE VIEW :schema.vw_trip_count AS
+SELECT count (DISTINCT trps.trip_id) AS trip_count, count(DISTINCT trps.route_id) AS route_count, rts.agency_id, gncy.agency_name FROM :schema.trips AS trps LEFT JOIN :schema.routes AS rts ON trps.route_id = rts.route_id LEFT JOIN :schema.agency AS gncy ON rts.agency_id = gncy.agency_id GROUP BY rts.agency_id, gncy.agency_name ORDER BY trip_count DESC, route_count DESC;