OS Cheat Sheets Codecademy, Learn the Command Line Notes Command Line Crash Course Command Shell Snippets CLI, regex, and Git The Linux Command Line Useful Shell Commands for Data Science SQL & NoSQL SQL & NoSQL SQL-NoSQL Cheat Sheets SQL-NoSQL Cheat Sheets Table of contents.
SQL¶
- SQL Injection is one of the many web attack types, an attacker can send request with malicious SQL statements then executed by database server. A successful SQL injection exploit Attacker can read sensitive data from the database, modify database data (Insert/Update/Delete), execute administration operations on the database (such as shutdown.
- Regular Expressions Cheat Sheet from DaveChild. A quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started. Find this Pin and more on educationalby Saravana Shanmugam.
- This 3-page SQL Cheat Sheet provides you with the most commonly used SQL statements. Download the SQL cheat sheet, print it out, and stick to your desk.
- Interactive cross-site scripting (XSS) cheat sheet for 2021, brought to you by PortSwigger. Actively maintained, and regularly updated with new vectors.
- SQL. PDF. See the notes below.

- SQL. PDF.
SQL notes¶
Basic Queries¶
- Commands are not case-sensitive: SELECTorselect;
- ;is not required;
- Dividing an integer by an integer gives an integer; use floats with decimals.
Add conditions¶
- < > = <> <= >= AND OR.
Filter out missing values (or non-missing values)¶
Set limits¶
- BETWEENis inclusive (like- <=and- >=);
Regex Cheat Sheet Pdf
Find patterns¶
- regex patterns like 'a%'for “begins with a”,'%B'for “ends with capital B”;
- %is a joker.
- INsubgroups, limited to a set.
Sql Regex Cheat Sheet Pdf
Command hierarchy¶

- DESCor ascending by default.
Aggregate (two ways)¶
Opening aggregation:
- COUNT(not missing or not null values),- SUM,- AVG,- MIN,- MAX.
Closing aggregation:
- count, sum, avg, min, max.
Unique values¶
Compute, transform, create new columns¶
- + - * /.
Add views¶
- Aliases for the headers.
SQLite¶
- SQLite. PDF.

Sql Regex Cheat Sheet Cheat
MySQL¶
Sql Regex Cheat Sheet Excel
- MySQL. PDF.
- Essential MySQL. PDF.
Sql Regex Cheat Sheet
- Essential Admin for MySQL. PDF only.
Regex Cheat Sheet Js
PostgreSQL¶
- PostgreSQL. PDF.
- PostgreSQL Interactive Terminal Commands. PDF.

- Essential PostgreSQL. PDF only.
NoSQL¶
- NoSQL and Data Scalability. PDF only.
- MongoDB. PDF only.
