From 1c1060cb13c33459f6c0191b908c49fadf2b4964 Mon Sep 17 00:00:00 2001
From: bot50 <bot@cs50.harvard.edu>
Date: Tue, 28 Apr 2026 14:05:21 +0000
Subject: [PATCH] 
 daviddoji-cs50/problems/2024/sql/moneyball@20260428T140521.392998134Z

---
 1.sql  |  8 ++++++++
 10.sql |  0
 11.sql |  0
 12.sql |  0
 2.sql  |  9 +++++++++
 3.sql  | 15 +++++++++++++++
 4.sql  | 13 +++++++++++++
 5.sql  |  9 +++++++++
 6.sql  | 14 ++++++++++++++
 7.sql  |  8 ++++++++
 8.sql  |  9 +++++++++
 9.sql  |  0
 12 files changed, 85 insertions(+)
 create mode 100644 1.sql
 create mode 100644 10.sql
 create mode 100644 11.sql
 create mode 100644 12.sql
 create mode 100644 2.sql
 create mode 100644 3.sql
 create mode 100644 4.sql
 create mode 100644 5.sql
 create mode 100644 6.sql
 create mode 100644 7.sql
 create mode 100644 8.sql
 create mode 100644 9.sql

diff --git a/1.sql b/1.sql
new file mode 100644
index 0000000..d9cbba5
--- /dev/null
+++ b/1.sql
@@ -0,0 +1,8 @@
+-- write a SQL query to find the average player salary by year.
+--     Sort by year in descending order.
+--     Round the salary to two decimal places and call the column “average salary”.
+--     Your query should return a table with two columns, one for year and one for average salary.
+SELECT "year", ROUND(AVG("salary"), 2) AS "average salary"
+FROM "salaries"
+GROUP BY "year"
+ORDER BY "year" DESC;
diff --git a/10.sql b/10.sql
new file mode 100644
index 0000000..e69de29
diff --git a/11.sql b/11.sql
new file mode 100644
index 0000000..e69de29
diff --git a/12.sql b/12.sql
new file mode 100644
index 0000000..e69de29
diff --git a/2.sql b/2.sql
new file mode 100644
index 0000000..f672ed0
--- /dev/null
+++ b/2.sql
@@ -0,0 +1,9 @@
+-- write a SQL query to find Cal Ripken Jr.’s salary history.
+--     Sort by year in descending order.
+--     Your query should return a table with two columns, one for year and one for salary.
+SELECT s."year", s."salary"
+FROM "salaries" AS s
+JOIN "players" AS p
+    ON s."player_id" = p."id"
+WHERE p."first_name" = "Cal" AND p."last_name" LIKE "Ripken%"
+ORDER BY "year" DESC;
diff --git a/3.sql b/3.sql
new file mode 100644
index 0000000..52d4460
--- /dev/null
+++ b/3.sql
@@ -0,0 +1,15 @@
+-- write a SQL query to find Ken Griffey Jr.’s home run history.
+--     Sort by year in descending order.
+--     Note that there may be two players with the name “Ken Griffey.” This Ken Griffey was born in 1969.
+--     Your query should return a table with two columns, one for year and one for home runs.
+SELECT perf."year", perf."hr"
+FROM "performances" AS perf
+JOIN "players" AS p
+    ON perf."player_id" = p."id"
+WHERE
+    p."first_name" = "Ken"
+    AND
+    p."last_name" LIKE "Griffey%"
+    AND
+    p."birth_year" = "1969"
+ORDER BY "year" DESC;
diff --git a/4.sql b/4.sql
new file mode 100644
index 0000000..9ea8b9c
--- /dev/null
+++ b/4.sql
@@ -0,0 +1,13 @@
+-- write a SQL query to find the 50 players paid the least in 2001.
+--     Sort players by salary, lowest to highest.
+--     If two players have the same salary, sort alphabetically by first name and then by last name.
+--     If two players have the same first and last name, sort by player ID.
+--     Your query should return three columns, one for players’ first names, one for their last names, and one for their salaries.
+SELECT
+    p."first_name", p."last_name", s."salary"
+FROM "players" AS p
+JOIN "salaries" AS s
+    ON s."player_id" = p."id"
+WHERE s."year" = "2001"
+ORDER BY s."salary" ASC, p."first_name" ASC, p."last_name" ASC, p."id" ASC
+LIMIT 50;
diff --git a/5.sql b/5.sql
new file mode 100644
index 0000000..6ad97a4
--- /dev/null
+++ b/5.sql
@@ -0,0 +1,9 @@
+-- write a SQL query to find all teams that Satchel Paige played for.
+--     Your query should return a table with a single column, one for the name of the teams.
+SELECT DISTINCT t."name"
+FROM "teams" AS t
+JOIN "performances" AS perf
+    ON perf."team_id" = t."id"
+JOIN "players" AS p
+    ON p."id" = perf."player_id"
+WHERE p."first_name" = "Satchel" AND p."last_name" = "Paige";
diff --git a/6.sql b/6.sql
new file mode 100644
index 0000000..8b87f93
--- /dev/null
+++ b/6.sql
@@ -0,0 +1,14 @@
+-- write a SQL query to return the top 5 teams, sorted by the total number of hits by players in 2001.
+--     Call the column representing total hits by players in 2001 “total hits”.
+--     Sort by total hits, highest to lowest.
+--     Your query should return two columns, one for the teams’ names and one for their total hits in 2001.
+SELECT
+    t."name",
+    SUM(perf."H") AS "total hits"
+FROM "teams" AS t
+JOIN "performances" AS perf
+    ON perf."team_id" = t."id"
+WHERE perf."year" = '2001'
+GROUP BY t."id", t."name"
+ORDER BY "total hits" DESC
+LIMIT 5;
diff --git a/7.sql b/7.sql
new file mode 100644
index 0000000..ab1b9e7
--- /dev/null
+++ b/7.sql
@@ -0,0 +1,8 @@
+-- write a SQL query to find the name of the player who’s been paid the highest salary, of all time, in Major League Baseball.
+--     Your query should return a table with two columns, one for the player’s first name and one for their last name.
+SELECT p."first_name", p."last_name"
+FROM "players" AS p
+JOIN "salaries" AS s
+    ON s."player_id" = p."id"
+ORDER BY s."salary" DESC
+LIMIT 1;
diff --git a/8.sql b/8.sql
new file mode 100644
index 0000000..019acc7
--- /dev/null
+++ b/8.sql
@@ -0,0 +1,9 @@
+-- write a SQL query to find the 2001 salary of the player who hit the most home runs in 2001.
+--     Your query should return a table with one column, the salary of the player.
+SELECT s."salary"
+FROM "salaries" AS s
+JOIN "performances" AS perf
+    ON perf."player_id" = s."player_id"
+WHERE s."year" = '2001' AND perf."year" = '2001'
+ORDER BY perf."HR" DESC
+LIMIT 1;
diff --git a/9.sql b/9.sql
new file mode 100644
index 0000000..e69de29