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Update DBMS/SQL/Week5/writeup.md

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Aadit Agrawal 2025-02-04 16:01:53 +05:30
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DBMS/SQL/Week5/writeup.md
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@ -411,6 +411,20 @@ DAA 2
```
### List the departments whose all course text books are published by a particular publisher.
```sql
SQL> select distinct dept
2 from course
3 where not exists(
4 select *
5 from text natural join book_adoption
6 where book_adoption.course# = course.course#
7 and publisher!='Pearson');
DEPT
------------------------------
ICT
```
### Find the students who have enrolled for course of more than one department
@ -418,13 +432,119 @@ DAA 2
### List the department which adopts all the books from the particular publisher
```sql
SQL> select distinct dept
2 from course natural join Book_Adoption
3 where book_isbn not in
4 (select book_isbn
5 from course natural join book_adoption join text using(book_isbn)
6 where publisher !='Pearson'
7 );
DEPT
------------------------------
ICT
SQL> select distinct dept
2 from course
3 where not exists
4 (
5 select *
6 from book_adoption natural join text
7 where publisher !='Cengage'
8 and course.course# =book_adoption.course#
9 );
DEPT
------------------------------
EVS
CS
```
### List the books which are adopted by the course as well as enrolled by the student
```sql
SQL> select booktitle
2 from text
3 where book_isbn in
4 (
5 select distinct book_isbn
6 from book_adoption join enroll using(book_isbn)
7 );
BOOKTITLE
--------------------
DBMS vol 1
DBMS vol 2
DAA vol 2
COA vol 666
DSD vol 99
Math vol 66
Poetry vol 0
7 rows selected.
```
### List the courses which has adapted at least two books from a specific publisher
```sql
SQL> select course#,cname
2 from text natural join book_adoption join course using(course#)
3 where publisher='Pearson'
4 group by (course#,cname)
5 having count(book_isbn)>=2;
COURSE# CNAME
---------- ------------------------------
1102 DAA
```
### Identify the students who are enrolled for maximum number of books.
```sql
SQL> select regno,name,count(book_isbn)
2 from enroll natural join student
3 group by regno,name having count(book_isbn)>= all
4 (select count(book_isbn)
5 from enroll natural join student
6 group by regno);
REGNO NAME COUNT(BOOK_ISBN)
---------- -------------------- ----------------
456 Aadit 2
123 Ashwin 2
789 Shrikanth 2
```
### List the publishers along with the number of books published by them.
```sql
SQL> select publisher,count(book_isbn)
2 from (select * from text)
3 group by publisher;
PUBLISHER COUNT(BOOK_ISBN)
-------------------- ----------------
Penguin 1
Cengage 2
OML 1
Pearson 3
Classmate 1
SQL>
SQL> select publisher,count(book_isbn)
2 from text
3 group by publisher;
PUBLISHER COUNT(BOOK_ISBN)
-------------------- ----------------
Penguin 1
Cengage 2
OML 1
Pearson 3
Classmate 1
```
### List the students who enrolled for all the books adopted by their course