Urgent help is needed SQL datatypes

[knowledgelover]

hi,
urgent help needed
i need to know all the data types in SQL database
each one used for what ? when is the best use ? and so on
which are fixed length and which are variable length ..

ex: nchar(n) : is a .......

specifically what data type should I choose for a column should be floating between 1- 4, with two digit after the float point

or just send me a link that I can take a tour on
thanks :)

[debasisdas]

What did Google say ? Have you tried for that option ? You nned to go through some basic book on the subject for all that.