From 781c7ced42724017f15f2a601521c88d33baec9a Mon Sep 17 00:00:00 2001
From: Shawn Kiernan <kiernan.shawn@gmail.com>
Date: Wed, 23 Jun 2021 16:53:08 -0500
Subject: [PATCH 1/2] Shawn and Sarah SQL queries solution

---
 school_queries.sql | 89 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 school_queries.sql

diff --git a/school_queries.sql b/school_queries.sql
new file mode 100644
index 0000000..30c09dc
--- /dev/null
+++ b/school_queries.sql
@@ -0,0 +1,89 @@
+select * from classes;
+
+select class_name, credits from classes
+where credits > 3;
+
+select * from classes 
+where credits % 2 = 0;
+
+select * from enrollments 
+join students 
+on enrollments.student_id = students.id 
+where students.first_name = 'Tianna' 
+AND enrollments.grade IS NULL;
+
+select students.first_name, * from enrollments 
+join students 
+on enrollments.student_id = students.id 
+where students.first_name = 'Tianna' 
+AND enrollments.grade IS NULL;
+
+select first_name, class_name from enrollments 
+join students
+on enrollments.student_id = students.id 
+join classes
+on enrollments.class_id = classes.id
+where students.first_name = 'Tianna' 
+AND enrollments.grade IS NULL;
+
+select first_name, last_name from students
+where first_name ilike('%t%') OR
+last_name ilike('%t%') AND
+birthdate < '1986-01-01'::date;
+
+select avg(age(current_date, birthdate)) from students;
+
+select first_name, last_name, line_1, city, state_name, zipcode from addresses
+join students on students.address_id = addresses.id
+where city ilike ('% %');
+
+select avg(credits) from classes;
+
+select first_name, last_name from students
+join enrollments on
+students.id = enrollments.student_id
+where grade like 'A%';
+
+select first_name, sum(credits) from students
+join enrollments
+on students.id = enrollments.student_id
+join classes
+on classes.id = enrollments.class_id
+group by first_name;
+
+select first_name, sum(credits) from students
+join enrollments
+on students.id = enrollments.student_id
+join classes
+on classes.id = enrollments.class_id
+where grade is not null
+group by first_name;
+
+select first_name, class_name from students
+join enrollments
+on students.id = enrollments.student_id
+join classes
+on classes.id = enrollments.class_id
+group by first_name, class_name
+order by 2;
+
+select first_name, last_name, birthdate from students
+where birthdate >= '1982-01-01' AND
+birthdate <= '1985-12-31';
+
+--insert into enrollments (student_id, class_id)
+-- (select student_id from enrollments
+-- join students
+-- on students.id = enrollments.student_id
+-- where last_name = 'Rohan'
+-- limit 1)
+-- (select class_id from classes
+-- join enrollments
+-- on classes.id = enrollments.class_id
+-- where class_name = 'PHYS 218');
+
+-- --INSERT into enrollments (student_id, class_id)
+-- SELECT student_id, class_id
+-- FROM students, enrollments, classes 
+-- WHERE students.last_name = 'Rohan'
+--   AND classes.class_name = 'PHYS 218';
\ No newline at end of file

From b51c40e6945a6a08b9e676d3c70bf1ccdb3e0d99 Mon Sep 17 00:00:00 2001
From: Shawn Kiernan <kiernan.shawn@gmail.com>
Date: Thu, 24 Jun 2021 11:28:58 -0500
Subject: [PATCH 2/2] Shawn and Sarah sql queries solution

---
 school_queries.sql | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/school_queries.sql b/school_queries.sql
index 30c09dc..589d8d6 100644
--- a/school_queries.sql
+++ b/school_queries.sql
@@ -86,4 +86,10 @@ birthdate <= '1985-12-31';
 -- SELECT student_id, class_id
 -- FROM students, enrollments, classes 
 -- WHERE students.last_name = 'Rohan'
---   AND classes.class_name = 'PHYS 218';
\ No newline at end of file
+--   AND classes.class_name = 'PHYS 218';
+
+insert into enrollments (student_id, class_id, grade)
+select * from 
+ (select id from students where first_name='Andre' and last_name='Rohan' limit 1) x
+,(select id from classes where class_name='PHYS 218' limit 1) y
+,(select 'A') z;
\ No newline at end of file