diff --git a/Nandini/SQLAssignments/NandiniVujani_1543_Assignment1.sql b/Nandini/SQLAssignments/NandiniVujani_1543_Assignment1.sql
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+--CREATE A TABLE WITH CHECK ,DEFAULT CONSTRAINTS
+CREATE TABLE Event(
+ EventID int PRIMARY KEY,
+ EventName varchar(50),
+ EventDate Date CHECK (EventDate >= CAST(GETDATE() AS DATE)),
+ Venue varchar(50) NOT NULL,
+ MaxAttendees int CHECK (MaxAttendees >0),
+ Status varchar(50) DEFAULT 'SCHEDULED');
+
+--THIS INSERTION GIVES THE DEFAULT VALUE TO STATUS COL AS I NOT MENTIONED THE STATUS COL IN INSERT STMT
+INSERT INTO Event (EventID, EventName, EventDate, Venue, MaxAttendees)
+VALUES
+ (1, 'Annual Tech Conference', CAST('2024-12-15' AS DATE), 'Convention Center', 500),
+ (2, 'Music Festival', CAST('2025-01-20' AS DATE), 'City Park', 1000);
+
+--This insert stmt throws error like conflicted with CHECK constraint of MaxAttendees as the attendees are zero
+INSERT INTO Event (EventID, EventName, EventDate, Venue, MaxAttendees,Status)
+VALUES
+ (1, 'Annual Tech Conference', CAST('2024-12-15' AS DATE), 'Convention Center', 0,'Pending');
+
+--This insert stmt throws error like conflicted with CHECK constraint of Date as it is less than the current date
+INSERT INTO Event (EventID, EventName, EventDate, Venue, MaxAttendees,Status)
+VALUES
+ (1, 'Annual Tech Conference', CAST('2024-01-15' AS DATE), 'Convention Center', 0,'Pending');
+
+--Create a table with all the below data types and insert records
+--INT, Varchar, Char, Nvarchar, Float, Double, Numeric, Date, Datetime
+-- Create the Datatype table
+CREATE TABLE DemoDataType (
+ ID INT PRIMARY KEY, -- Integer type
+ Name VARCHAR(100), -- Variable-length string
+ Code CHAR(10), -- Fixed-length string
+ Description NVARCHAR(255), -- Variable-length Unicode string
+ Price FLOAT, -- Approximate numeric with floating point
+ Amount NUMERIC(10, 2), -- Exact numeric with specified precision
+ CreatedDate DATE, -- Date type (without time)
+ CreatedAt DATETIME -- Date and time type
+);
+
+-- Insert records into the SampleData table
+INSERT INTO DemoDataType (ID, Name, Code, Description, Price, Amount, CreatedDate, CreatedAt)
+VALUES
+(1, 'Product A', 'A001', 'Description for Product A', 19.99, 100.00, '2023-01-01', '2023-01-01 10:00:00'),
+(2, 'Product B', 'B002', 'Description for Product B', 29.99, 200.50, '2023-02-01', '2023-02-01 11:30:00'),
+(3, 'Product C', 'C003', 'Description for Product C', 39.99, 300.75, '2023-03-01', '2023-03-01 12:45:00'),
+(4, 'Product D', 'D004', 'Description for Product D', 49.99, 400.20, '2023-04-01', '2023-04-01 09:15:00');
+
+SELECT * FROM DemoDataType;
+
+--CREATE TABLE WITH IDENTITY AND DO BELOW OPERATIONS
+--DELETE few rows and then Insert some records. Observe the Identity value and same process do it for TRUNCATE
+CREATE TABLE Fruit(
+ FruitID int IDENTITY(1,1) PRIMARY KEY,
+ FruitName varchar(50),
+ Quantity int ,
+ Price Decimal(10,2)); --Price per Item
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Apple', 100, 0.50);
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Banana', 150, 0.30);
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Orange', 200, 0.40);
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Grapes', 50, 2.00);
+
+SELECT * FROM Fruit;
+
+DELETE FROM Fruit WHERE FruitID = 2; -- Deletes Banana
+DELETE FROM Fruit WHERE FruitID = 4; -- Deletes Grapes
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Mango', 80, 1.50);
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Pineapple', 30, 3.00);
+
+--Check the current records again
+--After performing DELETE operations
+--the IDENTITY values for new inserts continue from the last highest value (in this case, 6).
+SELECT * FROM Fruit;
+
+--Truncate the Table
+TRUNCATE TABLE Fruit;
+
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Kiwi', 60, 1.20);
+INSERT INTO Fruit (FruitName, Quantity, Price) VALUES ('Strawberry', 40, 2.50);
+--Check the current records after truncate
+--After using TRUNCATE
+--the IDENTITY values reset to the initial seed value (in this case, 1).
+SELECT * FROM Fruit;
+
+--CREATE A TABLE WITH COMPUTED COLUMN
+CREATE TABLE Sales (
+ SaleID INT IDENTITY(1,1) PRIMARY KEY,
+ ProductName NVARCHAR(100),
+ OriginalPrice DECIMAL(10, 2),
+ DiscountPercentage DECIMAL(5, 2),
+ DiscountAmount AS (OriginalPrice * (DiscountPercentage / 100)) -- Computed column
+);
+
+INSERT INTO Sales (ProductName, OriginalPrice, DiscountPercentage)
+ VALUES ('Laptop', 1200.00, 10.00),
+ ('Tablet', 400.00, 5.00),
+ ('Headphones', 150.00, 20.00);
+
+SELECT * FROM Sales;
+
+UPDATE Sales SET DiscountPercentage = 20.00 WHERE SaleID = 2; -- Update discount
+
+SELECT * FROM Sales;
+
+--CREATE TWO TABLES ONE WITH PRIMARY KEY AND OTHER WITH FOREIGN KEY
+CREATE TABLE Customer (
+ CustomerID INT PRIMARY KEY, -- Primary Key
+ FirstName NVARCHAR(50),
+ LastName NVARCHAR(50),
+ Email NVARCHAR(100),
+ Phone NVARCHAR(15)
+);
+
+CREATE TABLE Orders (
+ OrderID INT PRIMARY KEY, -- Primary Key
+ OrderDate DATETIME,
+ Amount DECIMAL(10, 2),
+ CustomerID INT, -- Foreign Key
+ FOREIGN KEY (CustomerID) REFERENCES Customer(CustomerID) -- Foreign Key constraint
+);
+
+
+ALTER TABLE Customer
+DROP CONSTRAINT PK__Customer__A4AE64B816E3B4D5;
+
+ALTER TABLE Invoices
+DROP CONSTRAINT [FK__Invoices__Custom__44FF419A];
+-- Insert customers
+INSERT INTO Customer (CustomerID,FirstName, LastName, Email, Phone)
+ VALUES (1,'John', 'Doe', 'john.doe@example.com', '123-456-7890'),
+ (2,'Jane', 'Smith', 'jane.smith@example.com', '098-765-4321');
+INSERT INTO Customer (CustomerID,FirstName, LastName, Email, Phone)
+ VALUES (3,'John', 'Smith', 'john.smith@example.com', '111-406-7890'),
+ (4,'David', 'Gold', 'david@example.com', '111-444-7890'),
+ (5,'Harry', 'Potter', 'harry@example.com', '101-944-9090');
+-- Insert orders
+INSERT INTO Orders (OrderID,OrderDate, Amount, CustomerID) VALUES (1,GETDATE(), 150.00, 1); -- Order for John Doe
+INSERT INTO Orders (OrderID,OrderDate, Amount, CustomerID) VALUES (2,GETDATE(), 200.00, 2); -- Order for Jane Smith
+
+--Try to insert the record which is not there in primary key into the table where Foreign key created
+--THIS INSERT STMT CONFLICTS WITH THE FOREIGN KEY CONSTRAINT "FK__Orders__Customer__4222D4EF"
+INSERT INTO Orders (OrderID,OrderDate, Amount, CustomerID) VALUES (3,GETDATE(), 219.00, 3);
+
+--Try to insert the NULL values into foreign key table
+-- Insert an order with NULL CustomerID
+INSERT INTO Orders(OrderID,OrderDate, Amount, CustomerID) VALUES (4,GETDATE(), 100.00, NULL);
+
+SELECT * FROM Customer;
+SELECT * FROM Orders;
+
+--PRACTISE CASCADE
+CREATE TABLE Invoices (
+ InvoiceID INT IDENTITY(1,1) PRIMARY KEY, -- Primary Key
+ CustomerID INT, -- Foreign Key referencing Customers
+ InvoiceDate DATETIME,
+ TotalAmount DECIMAL(10, 2),
+ FOREIGN KEY (CustomerID) REFERENCES Customer(CustomerID)
+ ON DELETE CASCADE -- Cascades delete
+ ON UPDATE CASCADE -- Cascades update
+);
+-- Insert invoices
+INSERT INTO Invoices (CustomerID, InvoiceDate, TotalAmount) VALUES (1, GETDATE(), 250.00);
+INSERT INTO Invoices (CustomerID, InvoiceDate, TotalAmount) VALUES (2, GETDATE(), 450.00);
+
+SELECT
+ fk.name AS ForeignKeyName
+FROM
+ sys.foreign_keys AS fk
+JOIN
+ sys.tables AS t ON fk.parent_object_id = t.object_id
+WHERE
+ t.name = 'Orders';
+
+--DROPPING THE CONSTRAINT
+ALTER TABLE Orders
+DROP CONSTRAINT FK_Orders_Customer;
+
+ALTER TABLE Orders
+ADD CONSTRAINT FK_Orders_Customer FOREIGN KEY (CustomerID)
+REFERENCES Customer(CustomerID)
+ON DELETE SET NULL
+ON UPDATE SET DEFAULT;
+
+
+SELECT * FROM Customer;
+
+SELECT * FROM Orders;
+
+SELECT * FROM Invoices;
+
+--AS we have applied cascade command that customerid deletes from invoices table & in orders table set to null
+DELETE FROM Customer WHERE CustomerID=1;
+
+UPDATE Customer SET CustomerID=15 WHERE CustomerID=2;
+
+
+--ALTER TABLE
+--Create the Products table
+CREATE TABLE Products (
+ ProductID int PRIMARY KEY,
+ ProductName varchar(100) NOT NULL,
+ Price decimal(10, 2) NOT NULL,
+ Quantity int NOT NULL,
+ Email nvarchar(100) NULL
+);
+
+-- Change the column data type and length
+ALTER TABLE Products
+ALTER COLUMN Email varchar(150); -- Changing the length of the Email column
+
+-- Rename the column name
+EXEC sp_rename 'Products.ProductName', 'Name', 'COLUMN'; -- Renaming ProductName to Name
+
+-- Add new column
+ALTER TABLE Products
+ADD Category VARCHAR(50);
+
+-- Drop existing column
+ALTER TABLE Products
+DROP COLUMN Quantity;
+
+--Add a check constraint
+ALTER TABLE Products
+ADD CONSTRAINT CK_Products_Price CHECK (Price > 0);
+
+-- Remove the check constraint
+ALTER TABLE Products
+DROP CONSTRAINT CK_Products_Price;
+
+-------------------------------------------------------------------
+---Applied check and default constraint on the same column
+CREATE TABLE DemoTable (
+ StockID INT PRIMARY KEY IDENTITY(1,1),
+ StockName VARCHAR(100) NOT NULL,
+ Stock INT DEFAULT 0 CHECK (Stock >= 0) -- Default value is 0, and Stock must be >= 0
+);
+
+INSERT INTO DemoTable(StockName) VALUES ('Product A');
+SELECT * FROM DemoTable;