The document describes SQL queries performed on database tables for a university department and faculty database. The tables created are Departments and Faculty. Data is inserted and constraints are added. Joins are used to find department names and heads. Attributes like salary are added. Queries find faculty by department, those earning a certain salary range, departments by faculty count, and more.

1. #DBMS assignment 3(a)
#Author : Soumak Paul.
#Create table: DEPARTMENT
CREATE TABLE DEPARTMENT(
DeptCode varchar(4) NOT NULL,
DeptName varchar(40) NOT NULL,
HOD varchar(4),
PRIMARY KEY(DeptCode));
#Insert values into DEPARTMENT table.
INSERT INTO DEPARTMENT(DeptCode,DeptName,HOD)
VALUES('IT','Information Technology','F201');
INSERT INTO DEPARTMENT(DeptCode,DeptName,HOD)
VALUES('BIO','Bio Technology','F901');
INSERT INTO DEPARTMENT(DeptCode,DeptName,HOD)
VALUES('CSE','Computer Science and Engineering,'F101');
INSERT INTO DEPARTMENT(DeptCode,DeptName,HOD)
VALUES('NS','Natural Science','F506');
#Add a foreign key constraint in STUDENT against DeptCode column which
references department.
ALTER TABLE STUDENT
ADD FOREIGN KEY (DeptCode) REFERENCES DEPARTMENT(DeptCode);
#Create table: FACULTY
CREATE TABLE FACULTY(
FacultyCode varchar(4) NOT NULL,
FacultyName varchar(15) NOT NULL,
DateOfJoin date NOT NULL,
DeptCode varchar(4) NOT NULL,
PRIMARY KEY (FacultyCode));
#Insert values into FACULTY table.
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F101','M. Sinha','2005-01-01','CSE');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F105','P. Sarkar','2019-02-01','CSE');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F201','S. Mazumder','2005-09-15','IT');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F301','S. Mondal','2018-08-01','CSE');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F401','D. Majumdar','2003-12-01','IT');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F506','N. Biswas','2013-12-31','NS');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)

2. VALUES('F607','R. Paul','2007-04-10','BIO');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F704','S. Sarkar','2012-01-01','IT');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F808','K. Das','2010-06-15','IT');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F901','R. Roy','2017-06-15','BIO');
INSERT INTO FACULTY(FacultyCode,FacultyName,DateOfJoin,DeptCode)
VALUES('F902','R. Biswas','2018-06-15','BIO');
#Alter the table Faculty and add check constraint such that FacultyCode starts
with ‘F’
ALTER TABLE FACULTY
ADD CONSTRAINT FacultyCodeCheck CHECK (FacultyCode like 'F%');
#Alter the table Faculty and add check constraint such DeptCode is either
CSE,IT, BIO,NS
ALTER TABLE FACULTY
ADD CONSTRAINT DeptCodeCheck CHECK (DeptCode IN ('CSE','IT','NS','BIO'));
#Add constraint : DeptCode of Faculty is foreign key and references DeptCode
in Department.
ALTER TABLE FACULTY
ADD FOREIGN KEY (DeptCode) REFERENCES DEPARTMENT(DeptCode);
#Add Constraint: HOD of Department table is foreign key and references
FacultyCode of Faculty.
ALTER TABLE DEPARTMENT
ADD FOREIGN KEY (HOD) REFERENCES FACULTY(FacultyCode);
#Find the names of faculties of CSE Department.
SELECT FacultyName FROM FACULTY WHERE DeptCode = 'CSE';
#Find the number of faculties in the IT department
SELECT COUNT(*) FROM FACULTY WHERE DeptCode = 'IT';
#Find the number of faculties who joined in August​.
SELECT COUNT(*) AS 'Hired in August' FROM FACULTY
WHERE (MONTH(DateOfJoin) = 8);
#Show the names of the heads of departments with department name.
SELECT FACULTY.DeptCode AS 'DEPARTMENT NAME', FACULTY.FacultyName AS 'HOD NAME'
FROM FACULTY
INNER JOIN DEPARTMENT ON FACULTY.DeptCode = DEPARTMENT.DeptCode
GROUP BY DEPARTMENT.DeptCode
ORDER BY DEPARTMENT.DeptCode;

3. #Add an extra attribute to the faculty table - Salary Number(8,2)
ALTER TABLE FACULTY
ADD COLUMN SalaryNumber DECIMAL(8,2) AFTER DeptCode;
#Insert values into the corresponding field Salary Number(8,2) (Enter distinct
values).
UPDATE FACULTY SET SalaryNumber = '25000.00' WHERE FacultyCode = 'F101';
UPDATE FACULTY SET SalaryNumber = '15000.00' WHERE FacultyCode = 'F105';
UPDATE FACULTY SET SalaryNumber = '18000.00' WHERE FacultyCode = 'F201';
UPDATE FACULTY SET SalaryNumber = '16500.00' WHERE FacultyCode = 'F301';
UPDATE FACULTY SET SalaryNumber = '16000.00' WHERE FacultyCode = 'F401';
UPDATE FACULTY SET SalaryNumber = '18000.00' WHERE FacultyCode = 'F506';
UPDATE FACULTY SET SalaryNumber = '15000.00' WHERE FacultyCode = 'F607';
UPDATE FACULTY SET SalaryNumber = '11000.00' WHERE FacultyCode = 'F704';
UPDATE FACULTY SET SalaryNumber = '13000.00' WHERE FacultyCode = 'F808';
UPDATE FACULTY SET SalaryNumber = '20000.00' WHERE FacultyCode = 'F901';
UPDATE FACULTY SET SalaryNumber = '14000.00' WHERE FacultyCode = 'F902';
#Find the Department having more than one faculty.
SELECT DEPARTMENT.DeptCode
FROM FACULTY
INNER JOIN DEPARTMENT
ON FACULTY.DeptCode = DEPARTMENT.DeptCode
GROUP BY DEPARTMENT.DeptCode
HAVING COUNT(*) > 1;
#Find the name, department of the faculties who earn between 8000 and 12000.
SELECT FacultyName, DeptCode FROM FACULTY
WHERE (SalaryNumber >= 8000 AND SalaryNumber <= 12000);
#Find the name of the department with maximum faculties.
SELECT DeptName, COUNT(*) AS DEPTCOUNT FROM FACULTY
JOIN DEPARTMENT ON FACULTY.DeptCode = DEPARTMENT.DeptCode
GROUP BY DeptName
ORDER BY DEPTCOUNT DESC
LIMIT 1;
#Find the senior-most faculty.
SELECT * FROM FACULTY
ORDER BY DateOfJoin
LIMIT 1;
#Find the name of the faculty who has completed 5 years​.
SELECT FacultyName FROM FACULTY
WHERE (DATEDIFF(CURDATE(),DateOfJoin) > 1826);