From ffa92bbe28d9c0c9447b86dd97a5334e59377c7d Mon Sep 17 00:00:00 2001
From: Jan Kvapil <quapka@gmail.com>
Date: Sun, 12 Feb 2017 18:06:25 +0100
Subject: [PATCH 1/2] Solution for SUM and COUNT with nobel table

---
 sum-and-count-nobel.sql | 63 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 sum-and-count-nobel.sql

diff --git a/sum-and-count-nobel.sql b/sum-and-count-nobel.sql
new file mode 100644
index 0000000..f881d3d
--- /dev/null
+++ b/sum-and-count-nobel.sql
@@ -0,0 +1,63 @@
+/*
+The nobel table can be used to practice more SUM and COUNT functions.
+*/
+
+--#1
+/*
+Show the total number of prizes awarded. 
+*/
+SELECT COUNT(winner) FROM nobel
+
+--#2
+/*
+List each subject - just once 
+*/
+SELECT DISTINCT subject
+FROM nobel
+
+--#3
+/*
+Show the total number of prizes awarded for Physics. 
+*/
+SELECT COUNT(*) FROM nobel WHERE subject='Physics'
+
+--#4
+/*
+For each subject show the subject and the number of prizes. 
+*/
+SELECT subject, COUNT(*)
+FROM nobel
+GROUP BY subject
+
+--#5
+/*
+For each subject show the first year that the prize was awarded. 
+*/
+SELECT subject,MIN(yr)
+FROM nobel
+GROUP BY subject
+
+--#6
+/*
+For each subject show the number of prizes awarded in the year 2000. 
+*/
+SELECT subject, COUNT(winner)
+FROM nobel
+WHERE yr=2000
+GROUP BY subject
+
+--#7
+/*
+Show the number of different winners for each subject. 
+*/
+SELECT DISTINCT subject, COUNT(DISTINCT winner)
+FROM nobel
+GROUP BY subject
+
+--#8
+/*
+For each subject show how many years have had prizes awarded. 
+*/
+SELECT subject, COUNT(DISTINCT yr)
+FROM nobel
+GROUP BY subject
\ No newline at end of file

From a6024044c604407d4ac8423b30b849cc087c06f8 Mon Sep 17 00:00:00 2001
From: Jan Kvapil <quapka@gmail.com>
Date: Sun, 12 Feb 2017 19:47:31 +0100
Subject: [PATCH 2/2] ADD solutions 9-12

---
 sum-and-count-nobel.sql | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/sum-and-count-nobel.sql b/sum-and-count-nobel.sql
index f881d3d..126b503 100644
--- a/sum-and-count-nobel.sql
+++ b/sum-and-count-nobel.sql
@@ -60,4 +60,38 @@ For each subject show how many years have had prizes awarded.
 */
 SELECT subject, COUNT(DISTINCT yr)
 FROM nobel
-GROUP BY subject
\ No newline at end of file
+GROUP BY subject
+
+--#9
+/*
+Show the years in which three prizes were given for Physics. 
+*/
+SELECT yr FROM nobel
+WHERE subject='Physics'
+GROUP BY yr
+HAVING COUNT(yr)=3
+
+--#10
+/*
+Show winners who have won more than once. 
+*/
+SELECT winner FROM nobel
+GROUP BY winner
+HAVING COUNT(winner)>1
+
+--#11
+/*
+Show winners who have won more than one subject. 
+*/
+SELECT winner FROM nobel
+GROUP BY winner
+HAVING COUNT(DISTINCT subject) > 1
+
+--#12
+/*
+Show the year and subject where 3 prizes were given. Show only years 2000 onwards. 
+*/
+SELECT yr, subject FROM nobel
+WHERE yr >= 2000
+GROUP BY yr, subject
+HAVING COUNT(DISTINCT winner)=3
\ No newline at end of file