Added queries for S8 (MySQL).

Practical/Practical Exam/SQL/S8 - SQL Queries.md

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+# S8 - SQL Queries (in MySQL)
+
+**Problem Statement:**
+Consider following Relation:
+Companies (comp_id, name, cost, year)
+Orders (comp_id, domain, quantity)
+Execute the following query:
+1. Find names, costs, domains and quantities for companies using
+inner join.
+2. Find names, costs, domains and quantities for companies using
+left outer join.
+3. Find names, costs, domains and quantities for companies using
+right outer join.
+4. Find names, costs, domains and quantities for companies using
+Union operator.
+5. Create View View1 by selecting both tables to show company name
+and quantities.
+6. Create View View2 by selecting any two columns and perform
+insert update delete operations.
+7. Display content of View1, View2.
+
+---
+
+## Creating the database
+```sql
+CREATE DATABASE Store2;
+USE Store2;
+
+```
+
+## Creating tables:
+
+```sql
+CREATE TABLE Companies (
+  comp_id INT,
+  name VARCHAR(255),
+  cost INT,
+  year INT,
+  PRIMARY KEY (comp_id)
+);
+
+CREATE TABLE Orders (
+  comp_id INT,
+  domain VARCHAR(255),
+  quantity INT,
+  FOREIGN KEY (comp_id) REFERENCES Companies (comp_id)
+);
+
+```
+
+## Inserting data
+
+```sql
+INSERT INTO Companies VALUES
+(1, 'MEPA', 40500, 2024),
+(2, 'Wayne Industries', 950000, 2000),
+(3, 'Oscorp', 64600, 2013),
+(4, 'Lex Corp', 28500, 2001),
+(5, 'Vought', 77335, 2020);
+
+INSERT INTO Orders VALUES
+(1, 'Healthcare', 45),
+(2, 'Kevlar', 30),
+(3, 'Goblin masks', 62),
+(4, 'Haircare', 23),
+(5, 'Spandex', 9);
+
+```
+
+## Queries
+
+1. Find names, costs, domains and quantities for companies using inner join.
+```sql
+SELECT name, cost, domain, quantity FROM Companies INNER JOIN Orders ON Companies.comp_id = Orders.comp_id;
+SELECT DISTINCT name, cost, domain, quantity FROM Companies, Orders;
+
+```
+
+2. Find names, costs, domains and quantities for companies using left outer join.
+```sql
+SELECT name, cost, domain, quantity FROM Companies LEFT JOIN Orders ON Companies.comp_id = Orders.comp_id;
+
+```
+
+3. Find names, costs, domains and quantities for companies using right outer join.
+```sql
+SELECT name, cost, domain, quantity FROM Companies RIGHT JOIN Orders on Companies.comp_id = Orders.comp_id;
+
+```
+
+4. Find names, costs, domains and quantities for companies using Union operator.
+```sql
+SELECT name, cost FROM Companies UNION SELECT domain, quantity FROM Orders;
+
+```
+
+5. Create View View1 by selecting both tables to show company name and quantities.
+```sql
+CREATE VIEW View1 AS SELECT name, quantity FROM Companies INNER JOIN Orders ON Companies.comp_id = Orders.comp_id;
+SELECT * FROM View1;
+
+```
+
+6. Create View View2 by selecting any two columns and perform insert update delete operations.
+```sql
+-- Creating view
+CREATE VIEW View2 AS SELECT Companies.comp_id, domain FROM Companies INNER JOIN Orders ON Companies.comp_id = Orders.comp_id;
+SELECT * FROM View2;
+
+-- Insert operation
+INSERT INTO Companies VALUES (6, 'Stark Industries', 54322, 2012);
+INSERT INTO Orders VALUES (6, 'Vibranium', 66);
+SELECT * FROM View2;
+
+-- Update operation
+UPDATE View2 SET domain = 'Iridium' WHERE comp_id = 6;
+SELECT * FROM View2;
+
+-- Delete operation
+DELETE FROM Orders WHERE comp_id = 8;
+DELETE FROM Companies WHERE comp_id = 8;
+SELECT * FROM View2;
+
+```
+
+7. Display content of View1, View2.
+```sql
+SELECT * FROM View1;
+SELECT * FROM View2;
+
+```
+
+---