In R given a string like “fld1,fld2” how can I get something like “b.fld1=v.fld1 and b.fld2=v.fld2” for a SQL query. The string may have up to 10 distinct elements. This is for trying to build a join on the fly. b and v are the aliases for two tables. There willo only be two tables. Answer String interpolation with stringr::str_glue
Tag: r
Query for R Machine Learning Services – Filtering Categories in Where Clause
I am trying to run a query in SQL Server using the Machine Learning Services extension. So this is the problem I am having; DECLARE @query NVARCHAR(MAX) = ‘ SELECT CATEGORY1,CATEGORY2 FROM TABLE WHERE …
how parallel fetch data from MySQL with Sequel Pro in R
I want to fetch data from mysql with seqlpro in R but when I run the query it takes ages. here is my code : old_value<- data.frame() new_value<- data.frame() counter<- 0 for (i in 1:length(...
object Object error in R Shiny SQLite App
I am trying to develop an R Shiny app with an SQLite Database. But I am facing this error while getting any data from the database. The error message is: Loading required package: shiny Attaching …
Merge tables in R and update rows where dates overlap
I hope this makes sense – it’s my first post here so I’m sorry if the question is badly formed. I have tables OldData and NewData: I need merge these tables as below. Where IDs match, dates overlap, and Priority is higher in NewData, I need to update the dates in OldData to reflect NewData. I first tried to run
dbGetQuery unavailable for noctua::athena
I connected RStudio to Amazon Athena, and the database connection was successful. con <- dbConnect(noctua::athena(), aws_access_key_id = "***", ...
Import and display a jpeg from a SQL Server database using r
Work has asked us to import a series of jpeg files from a SQL Server database for display on a dashboard product we have. We are using R to query our db and build our dashboards so we need to be able …
R: How to use “NOT IN” logic in R
How can I convert below sql query to R Logic: SELECT * FROM FRUITS WHERE (ID||TYPE||DATE) NOT IN (SELECT (ID||TYPE||DATE) FROM SEASONAL_FRUITS)
Importing JSON data from SQL DB to an R dataframe
I would like to know whether there is a way of importing JSON data from a MySQL DB to an R dataframe. I have a table like this: I would like to get the columns ‘id’ and ‘json’. I am using RMySQL package for getting the data from the db to an R dataframe but this gives me only the
sql to dplyr – nested select statements
I am trying to translate sql to R using the dplyr library, which I am new to. How would I do it for the following SQL? Answer