misc: Add SQL practices

docker-compose.yml

@@ -27,9 +27,12 @@ services:
     restart: "always"
     env_file:
       - "env/test/.env"
+    ports:
+      - "5432"
+
 
   dbtest:
     <<: *pipenv
-    command: ["bash", "-c", "pipenv install --dev --deploy --system && pytest -s"]
+    command: ["bash", "-c", "pipenv install --dev --deploy --system && pytest -s -vvv"]
     depends_on:
       - testdb

docs/practices.md

@@ -0,0 +1,61 @@
+SQL practices
+===
+
+### ToC
+
+- [Practice 1](#practice-1)
+- [Practice 2](#practice-2)
+- [Practice 3](#practice-3)
+
+# Practice 1
+
+- Count the number of subordinate 'ENTERPRISE\_CUSTOMER' organizations for each organization.
+
+# Practice 2
+
+- Calculate the center of each `japan_segment`.
+
+# Practice 3
+
+- Select `japan_segments` within the bounds represented as the following GeoJSON.
+
+```json
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              130.27313232421875,
+              30.519681272749402
+            ],
+            [
+              131.02020263671875,
+              30.519681272749402
+            ],
+            [
+              131.02020263671875,
+              30.80909017893796
+            ],
+            [
+              130.27313232421875,
+              30.80909017893796
+            ],
+            [
+              130.27313232421875,
+              30.519681272749402
+            ]
+          ]
+        ]
+      }
+    }
+  ]
+}
+```
+
+![Kagoshima segments](./img/kagoshima_segments.png)

sql/japan_segments.sql

@@ -0,0 +1,49 @@
+begin;
+
+INSERT INTO japan_segments (
+    id,
+    bounds
+) VALUES 
+    (
+        'KAGOSHIMA_1'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((130.616250541204 30.6818181818182,130.616250541204 30.7272727272727,130.668206090345 30.7272727272727,130.668206090345 30.6818181818182,130.616250541204 30.6818181818182))')
+    )
+    ,(
+        'KAGOSHIMA_2'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((130.668206090345 30.6818181818182,130.668206090345 30.7272727272727,130.720161639486 30.7272727272727,130.720161639486 30.6818181818182,130.668206090345 30.6818181818182))')
+    )
+    ,(
+        'KAGOSHIMA_3'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((130.720161639486 30.6818181818182,130.720161639486 30.7272727272727,130.772117188628 30.7272727272727,130.772117188628 30.6818181818182,130.720161639486 30.6818181818182))')
+    )
+    ,(
+        'KAGOSHIMA_4'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.68105065666 30.7272727272727,129.68105065666 30.7727272727273,129.733006205802 30.7727272727273,129.733006205802 30.7272727272727,129.68105065666 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_5'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.733006205802 30.7272727272727,129.733006205802 30.7727272727273,129.784961754943 30.7727272727273,129.784961754943 30.7272727272727,129.733006205802 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_6'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.784961754943 30.7272727272727,129.784961754943 30.7727272727273,129.836917304084 30.7727272727273,129.836917304084 30.7272727272727,129.784961754943 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_7'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.836917304084 30.7272727272727,129.836917304084 30.7727272727273,129.888872853226 30.7727272727273,129.888872853226 30.7272727272727,129.836917304084 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_8'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.888872853226 30.7272727272727,129.888872853226 30.7727272727273,129.940828402367 30.7727272727273,129.940828402367 30.7272727272727,129.888872853226 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_9'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.940828402367 30.7272727272727,129.940828402367 30.7727272727273,129.992783951508 30.7727272727273,129.992783951508 30.7272727272727,129.940828402367 30.7272727272727))')
+    )
+    ,(
+        'KAGOSHIMA_10'
+        , ST_GeomFromEWKT('SRID=4326;POLYGON((129.992783951508 30.7272727272727,129.992783951508 30.7727272727273,130.044739500649 30.7727272727273,130.044739500649 30.7272727272727,129.992783951508 30.7272727272727))')
+    )
+;
+
+commit;

sql/schema.sql

@@ -32,3 +32,8 @@ CREATE TABLE enterprise_sales_enterprise_customers (
         customer_organization_id
     )
 );
+
+CREATE TABLE japan_segments (
+    "id" character varying(24) PRIMARY KEY NOT NULL,
+    "bounds" geometry(Polygon,4326) NOT NULL
+);

test/test_example.py

@@ -4,7 +4,10 @@ from .dbtest import (
 )
 
 import os
-from psycopg2.extras import RealDictCursor
+from psycopg2.extras import (
+    RealDictCursor,
+    RealDictRow
+)
 
 
 PATH_TO_SQL_DIR = os.path.abspath(
@@ -32,19 +35,140 @@ class TestExample(DbTest):
             
             assert len(organizations) == 7
 
-
     @dbconnect
-    def test_select_addresses(self, conn):
+    def test_count_the_number_of_subordinates(self, conn):
         self.load_fixtures(
             conn,
             os.path.join(PATH_TO_SQL_DIR, "organizations.sql")
         )
 
         sql = """
-        SELECT * FROM addresses;
         """
         with conn.cursor(cursor_factory=RealDictCursor) as cur:
             cur.execute(sql)
-            addresses = cur.fetchall()
-            
-            assert len(addresses) == 7
+            actual = cur.fetchall()
+            print(actual)
+            assert len(actual) == 7
+            assert actual == [
+                RealDictRow(**{
+                    "subordinates_count": 0,
+                    "id": 1,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 4,
+                    "id": 2,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 0,
+                    "id": 3,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 0,
+                    "id": 4,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 0,
+                    "id": 5,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 1,
+                    "id": 6,
+                })
+                , RealDictRow(**{
+                    "subordinates_count": 0,
+                    "id": 7,
+                })
+            ]
+
+    @dbconnect
+    def test_calculate_center_of_each_segment(self, conn):
+        self.load_fixtures(
+            conn,
+            os.path.join(PATH_TO_SQL_DIR, "japan_segments.sql")
+        )
+
+        sql = """
+        """
+        with conn.cursor(cursor_factory=RealDictCursor) as cur:
+            cur.execute(sql)
+            actual = cur.fetchall()
+            print(actual)
+            assert len(actual) == 10
+            assert actual == [
+                RealDictRow(**{
+                    "id": "KAGOSHIMA_1",
+                    "longitude": 130.642228315775,
+                    "latitude": 30.7045454545455,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_2",
+                    "longitude": 130.694183864916,
+                    "latitude": 30.7045454545455,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_3",
+                    "longitude": 130.746139414057,
+                    "latitude": 30.7045454545455,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_4",
+                    "longitude": 129.707028431231,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_5",
+                    "longitude": 129.758983980373,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_6",
+                    "longitude": 129.810939529514,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_7",
+                    "longitude": 129.862895078655,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_8",
+                    "longitude": 129.914850627797,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_9",
+                    "longitude": 129.966806176937,
+                    "latitude": 30.75,
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_10",
+                    "longitude": 130.018761726079,
+                    "latitude": 30.75,
+                })
+            ]
+
+    @dbconnect
+    def test_segments_using_geojson_boundary(self, conn):
+        self.load_fixtures(
+            conn,
+            os.path.join(PATH_TO_SQL_DIR, "japan_segments.sql")
+        )
+
+        sql = """
+        """
+        with conn.cursor(cursor_factory=RealDictCursor) as cur:
+            cur.execute(sql)
+            actual = cur.fetchall()
+            print(actual)
+            assert len(actual) == 3
+            assert actual == [
+                RealDictRow(**{
+                    "id": "KAGOSHIMA_1",
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_2",
+                })
+                , RealDictRow(**{
+                    "id": "KAGOSHIMA_3",
+                })
+            ]