https://github.com/rnddave/sql-like-a-boss

Not trying to become an SQL Master, but I am looking to up my SQL game.
https://github.com/rnddave/sql-like-a-boss

database databases mysql postgresql sql

Last synced: about 1 month ago
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Not trying to become an SQL Master, but I am looking to up my SQL game.

• Host: GitHub
• URL: https://github.com/rnddave/sql-like-a-boss
• Owner: rnddave
• Created: 2022-10-03T16:47:12.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-05-09T15:15:09.000Z (8 months ago)
• Last Synced: 2024-05-09T16:35:28.481Z (8 months ago)
• Topics: database, databases, mysql, postgresql, sql
• Language: PLpgSQL
• Homepage: https://david-dickinson.com
• Size: 32.2 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# The Story of Data

- Data everywhere

- Value & value creation 

- Constantly creating more new data 

- Data creation is increasing exponentially (data capture, data storage) 

## Some SQL History

Was originally called SEQUEL in early 1980's

- Structured

- English

- QUery

- Language

But there was some challenge to that name, hence; SQL 

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- [Codd's Twelve Rules](https://www.w3resource.com/sql/sql-basic/codd-12-rule-relation.php)

# DBMS does the CRUD

- Create 

- Read

- Update

- Delete

- Also, Security, Management, Transaction Handling etc

# The Tuple

A Tuple in this sense is a single row of data in a table 

Multiple rows = Tuples 

# Cardinality 

The collection of multiple rows of data = **The Cardinality**

# OLTP vs OLAP

2 types of relational database 

- Support Day to Day Business  

- Supports Data Analysis

### OLTP

- On-Line Transactional Processing

- Day-to-day-stuff

### OLAP

- On-Line Analytical Processing

- Analysing data so that Day-to-Day future decisions can be made 

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# SQL Command Buckets

- DDL

- DQL

- DML

- DCL

## DDL

- Data Definition Language

- Broad statements

- Used when setting up the database etc

- Change things etc

- CREATE

- ALTER

- DROP

- RENAME

- TRUNCATE

- COMMENT

## DQL

- Data Query Language

- Once a database is in place, most of your work is looking at data

- SELECT

## DML

- Data Modification Language

- data in the tables 

- DDL = Database Definitions, making changes to databases

- whereas DML = about the tables inside the database

- INSERT

- UPDATE

- DELETE

- MERGE

- CALL

- EXPLAIN PLAIN

- LOCK TABLE

## DCL

- Data Control Language

- Giving and revoking access

- GRANT

- REVOKE

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