normalização
What is database normalization?
I was chatting with some programmer friends when I heard the term "database normalization". Although I have heard this term a ... rm or can it be spoken in both ways?
I no longer want to be ashamed to hear such a term in a meeting and be misunderstood :)
Are redundancies in the database always undesirable?
I am developing a system that keeps a record of all the financial movements that occurred in a bank account (simple departure ... in the past discrepancies can be introduced - and without means of detecting them [if the redundant value is not present]).
Table normalization to 2nd Normal Form
A relation is in 2FN if and only if it is in 1FN and not
contains partial dependencies.
From this definition I am norm ... ke this, is the central idea of my normalization thinking correct?
Is there any other better way for me to normalize it?
When is it interesting to denormalize the database?
Is there a situation where having the database denormalized is more interesting than having it normalized ?
For example
N ... -----
| Fulano | Nova Iorque |
| Ciclano | Nova Iorque |
At some point is the second case more appropriate than the first?
Is it possible to state that the scheme is normalized in 3FN?
Explaining the context
On the internet I found an example of a scheme described like this:
Account (num-account, descr-a ... t, descr-account) and launch(numconta, NUM-lanc, data-lanc, value-lanc).
Doubt
Would the above example be normalized to 3FN?
Fields with same name in different tables
Fields with the same name in different tables can cause conflict at the time of normalizar or do some inner join?
Examples
... n possible concatenating Two table names to create the
name of a relationship table.
Valeria a same thing for the fields?
How to apply a mathematical expression to all columns of a table in SAS?
The expression will be applied to each of the 747 columns of a table/dataset.
Follow the expression:
(variable-mean variable) / (maximum variable value-minimum variable value).
Will be executed in the SAS.
Ternary relationship of entities in a relational schema would be counter-normative, and how to do this mapping in entity framework 6?
Taking as an example:
We can abstract the relationship in several ways, one of them would be putting n p/ N relationship ... rojectEmployee' with
table 'EMP_SKILL_PROJ' was already defined. Each EntitySet
must refer to a unique schema and table.
What is the best way to represent an address?
To model the address in an application and is committed to follow the standard way to represent it in the db (i.e. separate t ... denormalized field(e.g. if I want statistics by state, but I grouped cidade_estado_pais in one field, I will have problems).