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1)create table MarketingProjects(
ProjectID int,
ProjectName varchar(255),
Budget varchar(20)
);
alter table MarketingProjects add column(Status varchar(20));
insert into MarketingProjects values(
1,
'Project A',
'50000.00',
'null'
);
insert into MarketingProjects values(
2,
'Project B',
'75000.00',
'null'
);
insert into MarketingProjects values(
3,
'Project C',
'100000.00',
'null'
);
select * from MarketingProjects;

2) create table Employees
( ID int,
Name varchar(255),
Age int
);
3) alter table products modify column price decimal(10,2);
select *from products;

4) alter table contacts drop column phone_number;
select * from contacts;

5) select name,commission from salesman;

6) delete from order_details where order_date < '2020-01-01';

7) select * from emp_details where EMP_DEPT=57;

8) select num1,num2,(num1+num2) as AdditionResult from Calculations;

9) SELECT name, price FROM product_data ORDER BY price DESC LIMIT 5;

10) CREATE TABLE Accounts (
AccountID INT PRIMARY KEY,
AccountName VARCHAR(100),
Balance DECIMAL(10, 2)
);
INSERT INTO Accounts (AccountID, AccountName, Balance) VALUES
(123, 'Account A', 1000.00),
(456, 'Account B', 2000.00);
START TRANSACTION;
UPDATE Accounts
SET Balance = Balance - 500
WHERE AccountID = 123;
UPDATE Accounts
SET Balance = Balance + 500
WHERE AccountID = 456;
COMMIT;
SELECT * FROM Accounts;

11) start transaction;
create table Accounts (AccountID int, AccountName varchar(225),Balance varchar(230));
Insert into Accounts values(1, 'Savings',5000.00);
insert into Accounts values (2, 'Checking', 2500.88);
insert into Accounts values (3, 'Investment',10000.00);
select from Accounts;
commit

12) start transaction;
update Books set Quantity=28 where BookID=1;
update Books set LastUpdated='2024-04-15 09:02:00' where BookID=1;
select * from Books where BookID=1;
commit

13) create table students(ID int, Name varchar(20),Marks Int,department_id varchar(20));
insert into students value(1,'John Doe',90,null);
insert into students value(2,'Jane Smith',85,null);
insert into students value(3,'Michael Johnson',65,null);
insert into students value(4,'Emily Davis',88,null);
select * from students;

14) create table Employees(EmployeeID int primary key,Name varchar(225),
DepartmentID int,EmergencyContactName varchar(255),EmergencyContactPhone varchar(20));

15) select case when exists(select 1 from Purchases where PurchaseDate >=
date_sub(current_date(),interval 30 day))
then 'Yes'
else 'No'
end as Purchases_Last_30_Days

16) select * from products p1 where p1.product_id not in(select s.product_id from sales s);
select name,price from products where category='Electronics'union
select name,price from products where category='Books';
select product_id,name,round(price,0)as rounded_price from products where
category='Electronics' and price>any(select price from products where category='Books')

17) select order_status,count(*) as total_orders from
orders group by order_status order by order_status;

18) set @ri:=-1;
select category,avg(price) as median_price from (
select @ri:=if(@pg=Market.category,@ri+1,0) as ri,
@pg:=Market.category as category,
Market.price as price from Market order by Market.price,
Market.category) as p
where p.ri in(floor(@ri/2),ceil(@ri/2))
group by category
order by category;

19) SELECT DISTINCT Name FROM Actors WHERE ActorID IN ( SELECT ActorID FROM Cast WHERE
MovieID IN ( SELECT MovieID FROM Movies WHERE DirectorID = ( SELECT DirectorID FROM
Directors WHERE Name = 'Christopher Nolan' ) ));

20) create table Product(product_id int,sale_Amount
varchar(20)); insert into Product values(103,3500.00);
select(select product_id from Product where product_id=103)as top_selling_product,
(select sale_amount from Product where product_id=103)as total_sales_amount from Product;

21) select product_id from sales_2021 where product_id in(select product_id from sales_2020);
22) create table customer_information(customer_id int,name
varchar(255),email varchar(255),phone_number
varchar(255),address varchar(255));
create table product_data(product_id int,name varchar(255),description varchar(255),price
decimal(20,2),category_id int);
create table order_details(order_id int,customer_id int,product_id int,quantity int,order_date
date);

23) select Students.FirstName,Courses.CourseName from Students inner join
Courses On Students.CourseId=Courses.CourseID
where Students.Grade='A';

24) select Employees.FirstName,Department.DepartmentName from Employees join
Department on Employees.DeptID=Department.DeptID;

25) select DeliveryRatings.DeliveryBoyName,
avg(DeliveryRatings.rating)as AverageRating
from DeliveryRatings group by DeliveryRatings.DeliveryBoyName;

26) select * from BugReports
where ReportedBugs = (select MAX(ReportedBugs) from BugReports);

27) select Procedures.ProcedureType,
min(Surgery.SurgeryDuration) as
MinDuration,
max(Surgery.SurgeryDuration) as
MaxDuration from Procedures
join Surgery on Procedures.ProcedureID=
Surgery.ProcedureID
group by
ProcedureType;
28) SELECT c.CustomerID, c.CustomerName, COUNT(b.BookingID) AS TotalBookings FROM Customer c
JOIN Booking b ON c.CustomerID = b.CustomerID GROUP BY c.CustomerID, c.CustomerName;

29) CREATE VIEW EmployeeSalary AS SELECT EmployeeID, FirstName, LastName, Salary FROM
Employees; UPDATE EmployeeSalary SET Salary = 65000 WHERE EmployeeID = 1; SELECT FirstName,
LastName, Salary FROM EmployeeSalary;

30) CREATE VIEW EmployeeSalary AS SELECT EmployeeID, FirstName, LastName, Salary FROM
Employees; UPDATE EmployeeSalary SET Salary = 65000 WHERE EmployeeID = 1; SELECT FirstName,
LastName, Salary FROM EmployeeSalary;

31) -- Declare cursor
DECLARE employee_cursor CURSOR FOR
SELECT name, salary FROM employees;
OPEN employee_cursor;
-- Variables to store fetched data
DECLARE employee_name TEXT;
DECLARE employee_salary NUMERIC;
LOOP
FETCH employee_cursor INTO employee_name, employee_salary;
-- Exit loop if no more rows
EXIT WHEN NOT FOUND;
RAISE NOTICE 'Employee: %, Salary: %', employee_name, employee_salary;
END LOOP;
CLOSE employee_cursor;

32) CREATE TRIGGER update_salary_trigger
BEFORE UPDATE ON employee
FOR EACH ROW
SET NEW.last_salary_updated := CURRENT_DATE

33) CREATE TABLE Programs (
ProgramID INT PRIMARY KEY,
Title VARCHAR(100),
Description TEXT
);
CREATE TABLE Trainees (
TraineeID INT PRIMARY KEY,
FirstName VARCHAR(100),
LastName VARCHAR(100),
Email VARCHAR(100),
ProgramID INT,
FOREIGN KEY (ProgramID) REFERENCES Programs(ProgramID)
);
INSERT INTO Programs (ProgramID, Title, Description) VALUES
(1, 'Web Development', 'Learn to build websites using HTML, CSS, and JavaScrip(2, 'Data Analysis',
'Learn how to analyze data using Python and SQL.');
INSERT INTO Trainees (TraineeID, FirstName, LastName, Email, ProgramID) VALUES(1, 'Alice',
'Johnson', 'alice.johnson@example.com', 1),
(2, 'Bob', 'Brown', 'bob.brown@example.com', 2);
DELETE FROM Trainees WHERE TraineeID = 2;
SELECT
t.FirstName AS "First Name",
t.LastName AS "Last Name",
t.Email AS "Email",
p.Title AS "Program"
FROM
Trainees t
JOIN
Programs p ON t.ProgramID = p.ProgramID

34) CREATE TABLE EmployeeWorkLogs (
EmployeeID INT,
Date DATE,
RegularHours INT,
OvertimeHours INT
);
INSERT INTO EmployeeWorkLogs (EmployeeID, Date, RegularHours, OvertimeHours)
VALUES
(101, '2024-05-01', 8, 2),
(102, '2024-05-01', 8, 3),
(103, '2024-05-01', 8, 1),
(104, '2024-05-02', 8, 2),
(105, '2024-05-02', 8, 3),
(106, '2024-05-02', 8, 1),
(107, '2024-05-03', 8, 2),
(108, '2024-05-03', 8, 3),
(109, '2024-05-03', 8, 1),
(110, '2024-05-04', 8, 2);
SET @OvertimeRate = 20
SELECT
EmployeeID,
CONCAT('$', OvertimeHours * @OvertimeRate) AS OvertimePay
FROM
EmployeeWorkLogs;

35) CREATE TABLE Donors (
DonorID INT PRIMARY KEY,
FirstName VARCHAR(100),
LastName VARCHAR(100),
BloodType VARCHAR(5),
ContactNumber VARCHAR(15)
);
CREATE TABLE Donations (
DonationID INT PRIMARY KEY,
DonorID INT,
DonationDate DATE,
AmountDonated INT, -- in milliliters
FOREIGN KEY (DonorID) REFERENCES Donors(DonorID)
);
-- Inserting data into Donors
INSERT INTO Donors (DonorID, FirstName, LastName, BloodType, ContactNumber) VA(1, 'John',
'Doe', 'O+', '123-456-7890'),
(2, 'Jane', 'Doe', 'A+', '987-654-3210');
-- Inserting data into Donations
INSERT INTO Donations (DonationID, DonorID, DonationDate, AmountDonated) VALUE(1, 1,
'2024-04-01', 500),
(2, 2, '2024-04-02', 450);
DELETE FROM Donations WHERE DonorID = 1;
DELETE FROM Donors WHERE DonorID = 1;
UPDATE Donors
SET ContactNumber = '555-123-4567'
WHERE DonorID = 2;
SELECT
d.FirstName AS 'First Name',
d.LastName AS 'Last Name',
d.BloodType AS 'Blood Type',
don.DonationDate AS 'Donation Date',
don.AmountDonated AS 'Amount Donated'
FROM Donors d
JOIN Donations don ON d.DonorID = don.DonorID;

36) CREATE TABLE EmployeeLeaveBalances (
EmployeeID INT PRIMARY KEY,
LeaveType VARCHAR(50),
LeaveAccrued INT,
LeaveTaken INT
);
INSERT INTO EmployeeLeaveBalances (EmployeeID, LeaveType, LeaveAccrued, LeaveTVALUES
(001, 'Annual', 20, 5),
(002, 'Sick', 15, 3),
(003, 'Annual', 18, 4),
(004, 'Personal', 10, 2),
(005, 'Annual', 22, 6);
CREATE TABLE VerifiedLeaveBalances (
EmployeeID INT PRIMARY KEY,
LeaveType VARCHAR(50),
VerifiedLeaveBalance INT
);
-- Calculate verified leave balances and insert into the VerifiedLeaveBalancesINSERT INTO
VerifiedLeaveBalances (EmployeeID, LeaveType, VerifiedLeaveBalanceSELECT EmployeeID,
LeaveType, (LeaveAccrued - LeaveTaken) AS VerifiedLeaveBalaFROM EmployeeLeaveBalances;
SELECT * FROM VerifiedLeaveBalances
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