automated commit by submit50

10.sql

@@ -4,5 +4,6 @@ SELECT d."name", e."per_pupil_expenditure"
 FROM "expenditures" AS e
 JOIN "districts" AS d
 ON e."district_id" = d."id"
-ORDER BY "per_pupil_expenditure" DESC
+WHERE d."type" = 'Public School District'
+ORDER BY e."per_pupil_expenditure" DESC
 LIMIT 10;

11.sql

@@ -0,0 +1,14 @@
+-- write a SQL query to display the names of schools, their per-pupil expenditure, and their graduation rate.
+-- Sort the schools from greatest per-pupil expenditure to least.
+-- If two schools have the same per-pupil expenditure, sort by school name.
+--
+-- You should assume a school spends the same amount per-pupil their district as a whole spends.
+SELECT s."name", 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"
+ORDER BY e."per_pupil_expenditure" DESC, s."name" ASC;

12.sql

@@ -0,0 +1,33 @@
+-- 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;

13.sql

@@ -0,0 +1,21 @@
+-- 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;