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Author: deepakunique

06-07.sql

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+select order_id, customer_id, order_timestamp, total_amount,
+
+avg(total_amount) over (partition by customer_id order by order_timestamp
+	rows between 1 preceding and current row) as mvg_avg
+	from orders

07-04.sql

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+create procedure add_category(cat_id int, cat_name varchar)
+language plpgsql
+AS
+$$
+BEGIN
+ insert into categories values (cat_id, cat_name);
+END;
+$$;
+
+Call add_category(6, 'Fashion')
+
+select * from categories
+
+drop procedure add_category

07_02.sql

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+create view customer_order_summary AS
+
+select customer_id,
+count(order_id),
+sum(total_amount)
+from
+orders
+group by customer_id
+
+select * from customer_order_summary where customer_id =1

08-03.sql

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+explain analyze select * from orders where order_id=1
+
+select * from pg_stat_user_indexes where relname ='orders'
+
+explain  select * from orders where order_id=1

08_02.sql

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+create index idx_customer_email on customer(email);
+
+create index idx_prod_cat on products(category_id)
+
+create unique index idx_prod_name on products(name)
+
+create index idx_cust_order on orders(customer_id, order_timestamp)

08_04.sql

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+select * from orders where customer_id =1  order by order_timestamp desc
+create index idx_cust on orders(customer_id, order_timestamp)
+
+
+select * from orders where customer_id =1  order by order_timestamp desc limit 2

09_03.sql

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+create role mike with login
+
+create role tom with login password 'tom@123';
+
+create role John with login password 'John@123' superuser
+
+create role John1 with login password 'John@123' createdb;
+
+create role John2 with login password 'John@123' createrole
+
+create role John3 with login password 'John@123' valid until '2024-05-31'
+
+create role John4 with login password 'John@123' connection limit 10
+
+create role John5 with login password 'John@123' in role John4
+
+create user John6 with password 'John@123'

09_04.sql

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+grant select on customer to john1
+
+grant insert, delete on customer to john1
+
+grant select on all tables in schema public to john1
+
+grant select on customer to john1 with grant option
+
+revoke select on customer from john1
+
+revoke select, insert on customer from john1
+
+revoke all on customer from john1

09_05.sql

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+create role sales_team
+
+create role admins
+
+grant select on all tables in schema public to sales_team
+
+grant all privileges on all tables in schema public to admins
+
+create role sales_managers in role sales_team

10_01.sql

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+select * from customer
+
+select *  from customer where city = 'City1'
+
+select *  from customer where city = 'City1'
+
+select *  from customer where city  in ('City1', 'City2')
+
+select avg(customer_name) from customer
+
+select * from orders join customer on 

10_03.sql

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+select * from products where price is not null
+
+select true and null
+
+avg
+max
+min
+count(*)

10_04.sql

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+SELECT
+    DATE_TRUNC('month', o.order_timestamp) AS order_month,
+    SUM(o.total_quantity * p.price) AS total_sales
+FROM
+    orders o
+JOIN
+    products p ON o.product_id = p.product_id
+WHERE
+    o.order_timestamp >= '2023-01-01' AND
+    o.order_timestamp < '2025-04-01'
+GROUP BY
+    order_month
+ORDER BY
+    order_month;
+
+select * from orders where total_quantity is null
+
+select * from products where price is null
+
+select * from orders where product_id in (1, 4)
+
+update products set price =200 where product_id =4

12_02_Task1.sql

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+-- Task 1: Database Schema Creation
+-- Define tables: Customers, Policies, Claims, PolicyTypes.
+    -- Include fields such as CustomerID, PolicyID, ClaimID, PolicyTypeID, ClaimAmount, ClaimDate, 
+	-- PolicyStartDate, PolicyEndDate, etc.
+
+---Customers Table---------
+CREATE TABLE Customers (
+    CustomerID SERIAL PRIMARY KEY,
+    FirstName VARCHAR(50),
+    LastName VARCHAR(50),
+    DateOfBirth DATE,
+    Gender CHAR(1),
+    Address VARCHAR(100),
+    City VARCHAR(50),
+    State VARCHAR(50),
+    ZipCode VARCHAR(10)
+);
+
+---2. PolicyTypes Table
+
+CREATE TABLE PolicyTypes (
+    PolicyTypeID SERIAL PRIMARY KEY,
+    PolicyTypeName VARCHAR(50),
+    Description TEXT
+);
+
+----3. Policies Table
+
+CREATE TABLE Policies (
+    PolicyID SERIAL PRIMARY KEY,
+    CustomerID INT REFERENCES Customers(CustomerID),
+    PolicyTypeID INT REFERENCES PolicyTypes(PolicyTypeID),
+    PolicyStartDate DATE,
+    PolicyEndDate DATE,
+    Premium DECIMAL(10,2)
+);
+
+---4. Claims Table
+
+CREATE TABLE Claims (
+    ClaimID SERIAL PRIMARY KEY,
+    PolicyID INT REFERENCES Policies(PolicyID),
+    ClaimDate DATE,
+    ClaimAmount DECIMAL(10,2),
+    ClaimDescription TEXT,
+    ClaimStatus VARCHAR(50)
+);

12_02_Task2.sql

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+-- Task 2: Data Population
+-- Insert realistic sample data into each table, ensuring a variety of scenarios are represented, 
+-- such as different policy types, claim amounts, and customer profiles.
+
+INSERT INTO PolicyTypes (PolicyTypeName, Description) VALUES
+('Auto', 'Insurance coverage for automobiles'),
+('Home', 'Insurance coverage for residential homes'),
+('Life', 'Long-term insurance coverage upon the policyholder''s death'),
+('Health', 'Insurance coverage for medical and surgical expenses');
+
+----------
+
+INSERT INTO Customers (FirstName, LastName, DateOfBirth, Gender, Address, City, State, ZipCode) VALUES
+('John', 'Doe', '1980-04-12', 'M', '123 Elm St', 'Springfield', 'IL', '62704'),
+('Jane', 'Smith', '1975-09-23', 'F', '456 Maple Ave', 'Greenville', 'TX', '75402'),
+('Emily', 'Johnson', '1990-01-17', 'F', '789 Oak Dr', 'Phoenix', 'AZ', '85001'),
+('Michael', 'Brown', '1985-07-30', 'M', '321 Pine St', 'Riverside', 'CA', '92501');
+
+-------------
+INSERT INTO Policies (CustomerID, PolicyTypeID, PolicyStartDate, PolicyEndDate, Premium) VALUES
+(1, 1, '2021-01-01', '2022-01-01', 120.00),
+(2, 2, '2021-02-01', '2022-02-01', 150.00),
+(1, 3, '2021-03-01', '2024-03-01', 300.00),
+(3, 4, '2021-04-01', '2022-04-01', 200.00),
+(4, 1, '2021-05-01', '2022-05-01', 100.00);
+
+-----------------
+INSERT INTO Claims (PolicyID, ClaimDate, ClaimAmount, ClaimDescription, ClaimStatus) VALUES
+(1, '2021-06-15', 500.00, 'Car accident', 'Approved'),
+(2, '2021-07-20', 1000.00, 'House fire', 'Pending'),
+(3, '2021-08-05', 20000.00, 'Life insurance claim', 'Approved'),
+(4, '2021-09-10', 150.00, 'Doctor visit', 'Denied'),
+(5, '2021-10-22', 300.00, 'Car theft', 'Approved');
+

12_02_Task3.sql

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+-- Task 3: Analytical Queries
+-- Write a query to calculate the total number of claims per policy type.
+-- Use analytical functions to determine the monthly claim frequency and average claim amount.
+SELECT
+    pt.PolicyTypeName,
+    COUNT(c.ClaimID) AS TotalClaims
+FROM
+    Claims c
+JOIN
+    Policies p ON c.PolicyID = p.PolicyID
+JOIN
+    PolicyTypes pt ON p.PolicyTypeID = pt.PolicyTypeID
+GROUP BY
+    pt.PolicyTypeName
+ORDER BY
+    TotalClaims DESC;
+
+----------------------------------
+
+--- Query 2: Monthly Claim Frequency and Average Claim Amount
+
+SELECT
+    DATE_TRUNC('month', ClaimDate) AS ClaimMonth,
+    COUNT(*) AS ClaimFrequency,
+    AVG(ClaimAmount) AS AverageClaimAmount
+FROM
+    Claims
+GROUP BY
+    ClaimMonth
+ORDER BY
+    ClaimMonth;
+
+

12_02_Task4.sql

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+-- Task 4: 4. Optimization with 
+	-- Discuss the creation of indexes on any columns used frequently in WHERE clauses or as join keys to improve performance.
+
+CREATE INDEX idx_claims_claimdate ON Claims(ClaimDate);
+

12_02_Task5.sql

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+--Task 5: Roles and Permissions
+	-- Create roles: ClaimsAnalyst and ClaimsManager.
+	-- ‘ClaimsAnalyst’ role should have read-only access to claims and policies data.
+	-- ‘ClaimsManager’ role should have full access to claims data and the ability to update policy information.
+	
+CREATE ROLE ClaimsAnalyst  LOGIN PASSWORD 'password1';
+
+-- Create ClaimsManager Role
+CREATE ROLE ClaimsManager  LOGIN PASSWORD 'password2';
+
+
+-- Grant select on necessary tables
+GRANT SELECT ON Claims, Policies, PolicyTypes TO ClaimsAnalyst;
+
+GRANT SELECT, INSERT, UPDATE, DELETE ON Claims, Policies, PolicyTypes TO ClaimsManager;
+