Issue with converting to pdf

Hi all,
I am trying to get my final output as pdf. I connected to oracle sql and queried the data and that data i am trying to export to pdf. for say i have 10 columns in my table when i try to export all those columns to pdf only 3 columns are being exported .
below is my code:
title: "Test_DB_Table"
output: pdf_document

library(RODBC)
library(tidyverse)
library(knitr)
options(tinytex.verbose = TRUE)
con <- odbcConnect("******")
dth <- sqlQuery(con, paste("select a,b,c,d,e,f,g,h from *******"))
kable(dth)

i am able to get all the records in pdf output but not the columns. only 3 columns data i am getting. can somebody help me on this.
Thanks

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