Github Readme Cheat Sheet

Database

Select Database

For a full list of available emoji and codes, check out the Emoji-Cheat-Sheet. You can create a new paragraph by leaving a blank line between lines of text. Ignoring Markdown formatting. You can tell GitHub to ignore (or escape) Markdown formatting by using before the Markdown character. Jun 26, 2018 Template for a clear GitHub README (markdown). Contribute to ritaly/README-cheatsheet development by creating an account on GitHub. Git Cheat Sheets. Reference sheets covering Git commands, features, SVN migrations, and bash. Available in multiple languages.

Example

An awesome README template to jumpstart your projects! - osamax2/Best-README-Template.

Check selected database

Create Database

Create database by insert of first document.

Drop Database

Collection

Create Collection

List collections

Rename Collection

Drop Collection

Insert Document

Example

Query Document

Find

Select all documents

Example

For pretty formating, use .pretty()

Operators

List of all operators - see docs - https://docs.mongodb.com/manual/reference/operator/query/

Operation	Syntax	Example	SQL
Equality	`{<key>:<value>}`	`{kind: 'rat'}`	`where kind = 'rat'`
Less Than	`{<key>:{$lt:<value>}}`	`{age: {$lt: 2}}`	`where age < 2`
Less Than Equals	`{<key>:{$lte:<value>}}`	`{age: {$lte: 2}}`	`where age <= 2`
Greater Than	`{<key>:{$gt:<value>}}`	`{age: {$gt: 2}}`	`where age > 2`
Greater Than Equals	`{<key>:{$gte:<value>}}`	`{age: {$gte: 2}}`	`where age >= 2`
Not Equals	`{<key>:{$ne:<value>}}`	`{age: {$ne: 2}}`	`where age != 2`
In	`{<key>:{$in:[<value1>, <value2>, ...]}}`	`{age: {$in: [1, 2, 3]}}`	`where age in (1, 2, 3)`

Examples

Columns

Example

AND

Example

OR

Example

Limit & Offset

Sort

Update Documents

Example

By default, MongoDB will update only a single document. To update multiple documents, you need to set a parameter 'multi' to true.

Example

Save

Replace document by ID

Example

Deleting Documents

Work only with non-capped collections.

Remove only one

Example

Delete all documents

Example

Indexing

Get indexes

Example

Create index

or multi key index

Examples:

Parameters:

Eg.:

Background means build index on background, don't block the DB.

Example:

Drop index

Example

Count

Example

Aggregation

aggregation operators

$sum
$avg
$min
$max
$push
$addToSet
$first
$last

Example

By multiple keys

Markdown is a lightweight and easy-to-use syntax for styling all forms of writing on the GitHub platform.

What you will learn:

How the Markdown format makes styled collaborative editing easy
How Markdown differs from traditional formatting approaches
How to use Markdown to format text
How to leverage GitHub’s automatic Markdown rendering
How to apply GitHub’s unique Markdown extensions

What is Markdown?

Markdown is a way to style text on the web. You control the display of the document; formatting words as bold or italic, adding images, and creating lists are just a few of the things we can do with Markdown. Mostly, Markdown is just regular text with a few non-alphabetic characters thrown in, like # or *.

You can use Markdown most places around GitHub:

Comments in Issues and Pull Requests
Files with the .md or .markdown extension

For more information, see “Writing on GitHub” in the GitHub Help.

Examples

It's very easy to make some words bold and other words italic with Markdown. You can even link to Google!

Syntax guide

Here’s an overview of Markdown syntax that you can use anywhere on GitHub.com or in your own text files.

Headers

Emphasis

Lists

Unordered

Ordered

Images

Blockquotes

Inline code

GitHub Flavored Markdown

GitHub.com uses its own version of the Markdown syntax that provides an additional set of useful features, many of which make it easier to work with content on GitHub.com.

Note that some features of GitHub Flavored Markdown are only available in the descriptions and comments of Issues and Pull Requests. These include @mentions as well as references to SHA-1 hashes, Issues, and Pull Requests. Task Lists are also available in Gist comments and in Gist Markdown files.

Syntax highlighting

Here’s an example of how you can use syntax highlighting with GitHub Flavored Markdown:

You can also simply indent your code by four spaces:

Markup Language Cheat Sheet

Here’s an example of Python code without syntax highlighting:

Task Lists

If you include a task list in the first comment of an Issue, you will get a handy progress indicator in your issue list. It also works in Pull Requests!

Tables

You can create tables by assembling a list of words and dividing them with hyphens - (for the first row), and then separating each column with a pipe |:

Would become:

First Header	Second Header
Content from cell 1	Content from cell 2
Content in the first column	Content in the second column

SHA references

Any reference to a commit’s SHA-1 hash will be automatically converted into a link to that commit on GitHub.

Issue references within a repository

Any number that refers to an Issue or Pull Request will be automatically converted into a link.

Username @mentions

Typing an @ symbol, followed by a username, will notify that person to come and view the comment. This is called an “@mention”, because you’re mentioning the individual. You can also @mention teams within an organization.

Automatic linking for URLs

Any URL (like http://www.github.com/) will be automatically converted into a clickable link.

Strikethrough