Questions tagged [sql]
Structured Query Language (SQL) is a language for querying databases. Questions should include code examples, table structure, sample data, and a tag for the DBMS implementation (e.g. MySQL, PostgreSQL, Oracle, MS SQL Server, IBM DB2, etc.) being used.
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Moving a Neural Network to the SQL in R
tl;dr
How do I use something like the tidypredict tool to move a neural network either textbook mlp, or deep, to SQL code?
Background:
This is an example that shows how to convert a linear model to ...
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Hive Bring Table to Local Driver for Fast Debugging on CLI
I have a large Hive table on HDFS. Every time I query it, it runs a map reduce job which is slow.
For debugging my code on CLI, I want a fast query. Is it possible to sample rows of the table and ...
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Passing tuples (key, value) into parameterized SQL query in Python
NOTE: I am new to this community, so please let me know if I can help you help me!
I built a scraper in python that creates a tuple of (key, value).
I would like to pass both key and value as ...
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Are there decisive leaders in programming with tabular data?
What are the most effective bread-and-butter in-memory open source tabular data frameworks today? I have been working with tabular data for years with an in-house solution that integrates with Excel ...
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Self Union All in Tableau Public for Sankey Diagram
I'm following this 2017 YouTube tutorial from which I hope to learn Sankey diagrams.
At 2:28, he instructs us to select Convert to Custom SQL, after having opened ...
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Calculating correlation and covariance in MySQL
I am new to data science taking my first course in Data analysis. I am trying to figure out where to start with a problem solving the correlation and covariance with my sql.
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How to get a SQL sequence value with sqlalchemy?
I would like to use a SELECT NEXT VALUE FOR to get a value from a sequence in Microsoft SQL Server. It does not look like I can simply use ...
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Formal terminology: metafeatures then groupby (GROUP BY) operation
In ML training and other analytics I often combine features to produce a 'metafeature' and then perform a 'groupby' (pandas) or 'GROUP BY' (SQL) query. What is the technical term for this operation?
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How to programmatically manipulate SQL strings
As part of a hubby project I am working on, I need to be able to take SQL strings supplied by users, and then run it.
But before running it, i will like to do some manipulations to the SQL. For ...
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Reduce dimension (Words) for recommender
I have made a related document finder natively in SQL Server.
Currently I use the word as dimensions.
Based on that i calculate the cosinus simularty to figure out related article. At the moment the ...
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When using sqldf for join in python, is there a format to be followed for column names inside sql query?
I'm trying to use sqldf to do a left join on python. Here's my code:
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Why does PowerBI take longer to load data than PowerQuery takes to load preview?
I have a stored procedure in SQL Server and when I open PowerQuery, I can get a preview of the whole table in a minute or two. But once I click 'Apply and Close', it will take AGES to load and finally ...
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How to read a table from MySQL work bench in colab
I have referred to various articles on Stack Overflow and external sources but somehow am unable to get answer for this. I would like to read a table from MySQL workbench database into a dataframe in ...
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How to strategize model training with new data coming in every day?
I have a mysql database in which new records are added every day to raw data. This raw data is cleaned and a ML model is trained with it once a week. What should be the best strategy to capture new ...
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Using MySQL Common Table Expressions to solve the travelling salesman problem
The problem I'm trying to solve is very similar to the travelling salesman problem, where there are many paths between nodes in the database. I've tried to edit my example to fit into this well-known ...
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Best way to store large amounts of time series data? Relational database (SQL) or NoSQL route. Also additional python/pandas question inside
so I'm working on a project and I'm sort of stuck as to how to store my data. I have a concept I want to propose but am unsure whether it is possible, if it is not I would appreciate any help ...
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Creating a complex featureset for regression modeling
I am currently working a on project that requires me to convert all of the categorical variables to continuous (or binary) variables to build a regression model. The problem is that I have more than ...
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Load data from SQL for Machine Learning
I have an SQL DB which has millions of records(10 years of data) and wanted to implement some ML Models. Most of the courses/tutorials explains using a local file or downloaded CSV. But in my case I ...
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Running a query in R after establishing dbconnect
I do not seem to figure out what is wrong it the following statement. The connection to the DWH is established but the query statement in R seems not to work, with the following error :
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Tableau: How to change multiple field names
From SQL server I imported multiple tables that each have multiple fields. Unfortunately the field names are not that descriptive (data is originally from SAP) but I have a separate Excel file that ...
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