daviddoji-cs50/problems/2024/sql/dese@20260423T142111.229078345Z

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";

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;