Query to pick the "starting OES id" for ingress from MySQL

gistfile1.sql

WITH
config_oes_ids AS (
  SELECT (config->>'precedingOESId')::integer AS id, organization_id
  FROM connections
  GROUP BY organization_id
),
max_deliv_oes_ids AS (
  SELECT max(id) as id, organization_id
  FROM deliverables
  GROUP BY organization_id
),
mashup AS (
  SELECT COALESCE(md.id, cc.id) AS chosen_oes_id, md.id AS md, cc.id AS cc, c.organization_id
  FROM connections c
  LEFT JOIN config_oes_ids    AS cc USING (organization_id)
  LEFT JOIN max_deliv_oes_ids AS md USING (organization_id)
  WHERE (c.config->>'active') = 'true'
)
SELECT * FROM mashup
WHERE chosen_oes_id IS NOT NULL
;