daviddoji-cs50/problems/2024/sql/dese@20260427T154107.177384157Z

13.sql

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+-- write a SQL query to answer a question you have about the data! The query should:
+--
+-- Involve at least one JOIN or subquery
+-- Which schools have the highest graduation rates in districts that spend less than the average per-pupil expenditure?
+SELECT
+    s."name" AS "school",
+    d."name" AS "district",
+    e."per_pupil_expenditure",
+    g."graduated"
+FROM "schools" AS s
+JOIN "districts" AS d
+    ON s."district_id" = d."id"
+JOIN "expenditures" AS e
+    ON d."id" = e."district_id"
+JOIN "graduation_rates" AS g
+    ON s."id" = g."school_id"
+WHERE e."per_pupil_expenditure" < (
+    SELECT AVG("per_pupil_expenditure")
+    FROM "expenditures"
+)
+ORDER BY g."graduated" DESC, s."name" ASC;