daviddoji-cs50/problems/2024/sql/dese@20260427T150349.104069156Z

1.sql

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+-- write a SQL query to find the names and cities of all public schools in Massachusetts.
+SELECT "name", "city" FROM "schools" WHERE "type" = "Public School";

10.sql

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+-- write a SQL query to find the 10 public school districts with the highest per-pupil expenditures.
+-- Your query should return the names of the districts and the per-pupil expenditure for each.
+SELECT d."name", e."per_pupil_expenditure"
+FROM "expenditures" AS e
+JOIN "districts" AS d
+ON e."district_id" = d."id"
+WHERE d."type" = 'Public School District'
+ORDER BY e."per_pupil_expenditure" DESC
+LIMIT 10;

2.sql

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+-- write a SQL query to find the names of districts that are no longer operational.
+SELECT "name" FROM "districts" WHERE "name" LIKE "%(non-op)";

3.sql

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+-- write a SQL query to find the average per-pupil expenditure. Name the column “Average District Per-Pupil Expenditure”.
+SELECT AVG("per_pupil_expenditure") AS "Average District Per-Pupil Expenditure" FROM "expenditures";

4.sql

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+-- write a SQL query to find the 10 cities with the most public schools.
+-- Your query should return the names of the cities and the number of public schools within them,
+-- ordered from greatest number of public schools to least. If two cities have the same number of public schools,
+-- order them alphabetically.
+SELECT "city", COUNT(*) AS "Number of schools"
+FROM "schools"
+WHERE "type" = "Public School"
+GROUP BY "city"
+ORDER BY "Number of schools" DESC, "city" ASC
+LIMIT 10;

5.sql

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+-- write a SQL query to find cities with 3 or fewer public schools. Your query should return the names of the cities
+-- and the number of public schools within them, ordered from greatest number of public schools to least.
+-- If two cities have the same number of public schools, order them alphabetically.
+SELECT "city", COUNT(*) AS "Number of schools"
+FROM "schools"
+WHERE "type" = "Public School"
+GROUP BY "city"
+HAVING COUNT(*) <= 3
+ORDER BY "Number of schools" DESC, "city" ASC;

6.sql

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+-- write a SQL query to find the names of schools (public or charter!) that reported a 100% graduation rate.
+SELECT "name"
+FROM "schools"
+WHERE "id" IN (
+    SELECT "school_id"
+    FROM "graduation_rates"
+    WHERE "graduated" = 100
+    )
+;

7.sql

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+-- write a SQL query to find the names of schools (public or charter!) in the Cambridge school district.
+-- Keep in mind that Cambridge, the city, contains a few school districts, but DESE is interested in the
+-- district whose name is “Cambridge.”
+SELECT s."name"
+FROM "schools" AS s
+JOIN "districts" AS d
+    ON s."district_id" = d."id"
+WHERE d."name" = 'Cambridge';

8.sql

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+-- write a SQL query to display the names of all school districts and the number of pupils enrolled in each.
+SELECT d."name", e."pupils"
+FROM "expenditures" AS e
+JOIN "districts" AS d
+ON e."district_id" = d."id";

9.sql

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+-- write a SQL query to find the name (or names) of the school district(s) with the single least number of pupils.
+-- Report only the name(s).
+SELECT d."name"
+FROM "expenditures" AS e
+JOIN "districts" AS d
+ON e."district_id" = d."id"
+ORDER BY "pupils" ASC
+LIMIT 1;