All Questions

2
answers

What is considered when ordering a varchar field? Being filled by numbers

I have a table with the birthdays of the month, for a reason of use here we should store this as varchar . In the use of it it is necessary to sort by the date from the most recent to the oldest, it used this command: SELECT * FROM m...
asked on 07.05.2018 / 18:41
1
answer

R - Map of Brazilian cities

Good morning, I'm trying to create a Brazilian map that shows how many cooperatives are present in each city. I have a table with the municipalities IBGE code and the amount of coop. I took shapefile from the IBGE website: link...
asked on 25.09.2018 / 15:11
1
answer

bar graph ggplot 2 side-by-side vectors

Can anyone tell me if it's possible to make this chart with the bars side by side without using data frames or "melt"? v1=c(100,120,140) v2=c(125, 102,104) a=data.frame(year=factor(2003:2005)) ggplot(data=a, aes(x=year)) + geom_bar(aes(y =...
asked on 31.10.2018 / 20:19
1
answer

Problem using ggplot by group

This is my dataframe: structure(list(ind = structure(c(177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L, 177L,...
asked on 16.09.2018 / 05:25
2
answers

In an architecture, does the number of DLLs influence performance? Scalability?

I have the habit of creating my solution like this: Entity - Class Library (Classes, entities) Utils - Class Library (Classes of help, security, generate xml, anyway, functions of all kinds) Repository - repository pattern...
asked on 04.04.2014 / 15:47
3
answers

Why does the first element of the vector go out as zero without having saved that value there?

Why does the following code print a 0 at the beginning of output ? #include <stdio.h> #include <limits.h> // Escreva um programa que leia do teclado 8 valores, e em seguida os // imprima em ordem inversa....
asked on 12.10.2018 / 23:20
1
answer

Concept of deadlock in Java

I came across the term deadlock in Java. But I can not understand it. So I would like to ask these questions: What is a deadlock? Why and how to avoid a deadlock?
asked on 16.11.2018 / 21:54
4
answers

Login condition with user or email in the same field

I am creating a system for schools, where the teacher, when registering, inserts data such as name, email, user and password. So far the teacher can log in with email, but I wish I could login with the name too (I made changes but this is giving...
asked on 09.05.2018 / 15:45
1
answer

What is Feature Driven Development (FDD)?

I was researching on BDD, TDD and DDD and came across FDD (Feature Driven Development), after all: What is FDD? Does it have any relationship to BDD, TDD, and DDD?
asked on 17.08.2018 / 18:42
1
answer

Loading animation

I have a code that does a loading animation before starting a page. css.css .preload{ position: fixed; z-index:99999; top:0; left:0; width:100%; height:100%; opacity:1; background-color:#fff; /*background-ima...
asked on 03.07.2018 / 13:52