R ggplot only shows one bar - r

Question

I am just starting to work with R, so apologies if my question is too basic,
I have an excel sheet , here's the link: https://file.io/LfsAOdDCVnFq
where I am trying to plot a simple bar plot as follows:
X = I want it to be my sample names , the column called OTU ID in the file
Y = I want it to be the sum of my variables for each sample, column called Sum ZOTUs in the file
so far, I have installed and called library of ggplot2 and tried to plot my data frame but when I do that it only shows one bar, and I don't know what is wrong
install.packages("readxl")
install.packages("ggplot2")
library(readxl)
library(ggplot2)
ZOTU <- read_excel(file.choose())
ggplot(data=ZOTU, aes(x="OTU ID")) + geom_bar ()
and it shows the plot below:
can anyone help how to fix this?
Thanks

Answer 1

I can't see your uploaded image with the excel sheet screenshot.
My guess would be using quotation marks instead of backticks. Try running this code:
ggplot(data = ZOTU, aes(x = `OTU ID`)) + geom_bar()

Answer 2

First
Your question can be better formulated, please read how to ask a good question and how to create a minimal example to understand the basics of a workable question.
In R, you have a very good tool for creating reproducible examples: the reprex package
Also, I would not download anything from a given link in a random question in StackOverflow, and neither should you.
Try
Execute this code in your computer, and see if it helps you understand how ggplot works:
library(ggplot2) # load ggplot
mpg # let's look at a 'mpg' data included in the ggplot package
# Now, a simple bar plot
ggplot(mpg, aes(x = fl)) +
geom_bar()
We use the mpg data as the data for our figure, and we set the x-axis to be the fl column of that data. Finally, we "add" a bar plot to the figure.
By default, the bar plot will plot the count of the different values present in the column you passed as x-axis.
After comments
Following our discussion in the comment section, maybe this is what you want.
If you have the names (discrete variable) for the x-axis in a column, and another column with the variable you want to sum and plot in y for each name, try:
ggplot(data = mpg) +
geom_col(aes(x = manufacturer, y = hwy))
You can have the values with the code
library(tidyverse)
mpg %>% group_by(manufacturer) %>% summarize(total = sum(hwy))
So for your case, if you have a column with the names you want in the x-axis, and another with the values you want the code to sum for each name, use
ggplot(data = your_data_frame) +
geom_col(aes(x = your_names, y = values_to_be_summed_for_each_name))