-- write a SQL query to find public school districts with above-average per-pupil expenditures and
-- an above-average percentage of teachers rated “exemplary”. Your query should return the districts’ names,
-- along with their per-pupil expenditures and percentage of teachers rated exemplary. Sort the results first by
-- the percentage of teachers rated exemplary (high to low), then by the per-pupil expenditure (high to low).

-- You might find it helpful to know that subqueries can be inserted into most any part of a SQL query,
-- including conditions. For instance, the following is valid SQL syntax:

-- SELECT "column" FROM "table"
-- WHERE "column" > (
--     SELECT AVG("column")
--     FROM "table"
-- );

SELECT
    d."name",
    e."per_pupil_expenditure",
    s."exemplary"
FROM "districts" AS d
JOIN "expenditures" AS e
    ON d."id" = e."district_id"
JOIN "staff_evaluations" AS s
    ON d."id" = s."district_id"
WHERE d."type" = 'Public School District'
  AND e."per_pupil_expenditure" > (
      SELECT AVG("per_pupil_expenditure")
      FROM "expenditures"
  )
  AND s."exemplary" > (
      SELECT AVG("exemplary")
      FROM "staff_evaluations"
  )
ORDER BY s."exemplary" DESC, e."per_pupil_expenditure" DESC;