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