sql-test/docs/practices.md

SQL practices

ToC

• Practice 1
• Practice 2
• Practice 3

Practice 1

• Count the number of subordinate 'ENTERPRISE_CUSTOMER' organizations for each organization.

SELECT
    COUNT(customers.*) AS "subordinates_count",
    organizations.id AS "id"
FROM organizations
LEFT OUTER JOIN enterprise_sales_enterprise_customers customers ON customers.sales_organization_id = organizations.id
GROUP BY organizations.id
ORDER BY organizations.id ASC
;

Practice 2

• Calculate the center of each japan_segment.

SELECT
    id,
    ST_X(ST_Centroid(bounds)) AS "longitude",
    ST_Y(ST_Centroid(bounds)) AS "latitude"
FROM japan_segments
;

Practice 3

• Select japan_segments within the bounds represented as the following GeoJSON.

{
  "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
            ]
          ]
        ]
      }
    }
  ]
}

SELECT id FROM japan_segments
WHERE ST_Within(
    bounds,
    ST_SetSRID(ST_GeomFromGeoJSON('{
        "type": "Polygon",
        "coordinates": [
            [
                [
                    130.27313232421875,
                    30.519681272749402
                ],
                [
                    131.02020263671875,
                    30.519681272749402
                ],
                [
                    131.02020263671875,
                    30.80909017893796
                ],
                [
                    130.27313232421875,
                    30.80909017893796
                ],
                [
                    130.27313232421875,
                    30.519681272749402
                ]
            ]
        ]
    }'), 4326)
);