Chirag Chamoli chiragchamoli

1NF is the most basic of normal forms - each cell in a table must contain only one piece of information, and there can be no duplicate rows.

2NF and 3NF are all about being dependent on the primary key. Recall that a primary key can be made up of multiple columns. As Chris said in his response:

The data depends on the key [1NF], the whole key [2NF] and nothing but the key [3NF] (so help me [Codd][1]).

2NF

Say you have a table containing courses that are taken in a certain semester, and you have the following data:

Functions without a name

Simply put, a lambda is a function without a name, or an anonymous function. A small piece of executable code, that can be passed around as if it were a variable. In JavaScript:

function () {}; // very simple

Let's see now some uses for these lambdas.

Abstracting boilerplate code

Lambdas may be used to abstract away boilerplate code. For example loops. We're used to write for and while loops all day long. But this is code that does not be written. We could extract the code inside the loop, the most important part of the loop, and abstract away the rest:

	Primary Commands
	d delete
	y copy
	c change
	r replace
	p paste
	u undo
	a append
	o new line
	x delete char

	(from jQuery in Action)

	Basic CSS selectors

	* - any element
	E - elements with tag E
	E F - elements with tag F that are descendants of E
	E>F - elements with tag F that are direct children of E
	E+F - elements F immediately preceded by sibling E
	E~F - elements F preceded by any sibling E

	1xx Informational
	100: Continue (:continue)
	101: Switching Protocols (:switching_protocols)
	102: Processing (:processing)

	2xx Success
	200: OK (:ok)
	201: Created (:created)
	202: Accepted (:accepted)
	203: Non-Authoritative Information (:non_authoritative_information)

	android-group-iit-bombay@googlegroups.com,
	occ-kolkata@googlegroups.com,
	occdelhi@googlegroups.com,
	mumbai-startup@googlegroups.com,
	mrug@googlegroups.com,
	hydstartups@googlegroups.com,
	pune-cloudcomputing@googlegroups.com,
	eventsbangalore@googlegroups.com,
	thoughtworks-bangalore-geek-nights@googlegroups.com,
	nen-eclub-pune@googlegroups.com,


	DropBox YC Application
	http://dl.dropbox.com/u/27532820/app.html

	Reddit YC Application
	http://alexisohanian.com/our-y-combinator-summer-05-application-what-w

	FamilyLeaf YC Application
	http://dl.dropbox.com/u/19699329/FamilyLeaf_YC_application.pdf

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