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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10 views

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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(sql)How DISTINCT statement operates in this query? [migrated]

In a query, SELECT modal_text, COUNT(DISTINCT CASE WHEN ab_group = ‘control’ THEN user_id END) AS ‘control_clicks’ FROM onboarding_modals GROUP BY 1 ORDER BY 1; I can’t understand why, in line 2, ...
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11 views

What are best practice ETL stages for an API to SQL datamart?

Here's the scenario: I would like to create a datamart for US patents using the PatentsView JSON API. This requires dumping a large amount of data once and then appending thereafter in regular ...
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1answer
35 views

How to execute a git project with different input data?

I would like to run this project and receive result from this project However I have problem to execute the step mailcorpus.json created by executing the sql script data/get_mail_corpus.sql on ...
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14 views

Prepping Sales data for Basket Analysis

I've been playing around trying to teach my self some basic data science with datasets I have access to work, I've just finished prepping a 46 million row dataset which I wrangled using pandas and sql ...
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12 views

Power BI RLS through SQL stored procedure

I need dynamic RLS for Power BI - the way that the client has their data structured is that they have SQL RLS through a stored procedure. How can I translate that into power bi?
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1answer
15 views

CASE sentence for SQL query

I have a question abut MySQL I would like to handle a column with characters without changing the original DB. Below is the levels of the column named 'Maker'. 기아, 현대, BMW, VolksWagen, Porsche So ...
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1answer
202 views

What should I master better for professional data science in economics and finance? [closed]

First, excuse me for the noob and long question which is probably doesn’t even belong to here, I know there are several question been answered like this out there, but I think this is going to be up-...
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2answers
39 views

How to deal with millions or rows of data for analysis/visualization purpose [closed]

I have data in 2 tables in Sql server. First table has around 10 million rows and 8 columns. Second table has 6 million rows and 60 columns. I want to import those tables into a Python notebook ...
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1answer
36 views

Data enrichment of geographical records

I have a user_data table with various fields, some of them are based on geography. I'd like to enrich the data with additional columns, like ...
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4answers
66 views

How do Data Scientists integrate Predictive Modeling with SQL?

I've heard a lot about the importance of knowing SQL but how do you guys at the larger firms integrate your software for modeling/analysis with the server that holds the data? Do you simply access ...
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6 views

Create a local subset copy of a cloud based MS SQL database

I have a large MS SQL database hosted on Azure. I want to develop an analysis pipeline for the data. I'm developing this pipeline locally and it's slowing down my development. I think if I had a local ...
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15 views

Analyze additions and subtractions to/from a data set

I have a data set in the following form: ...
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0answers
29 views

Filtering unique row values in SQL, Advanced

My data looks like this: Number(String), Number2(String), TransactionType(String), Cost(Integer) For number 1, Cost 10 and -10 cancel out so the remaining cost is 100 For number 2, Cost 50 and -...
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20 views

Probabilistic guarantees for SQL query execution

We are working on a project that tries to accelerate Spark SQL using dedicated hardware. Our approach works much better (in terms of the resulting latency) if we allow query processing that is only ...
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1answer
34 views

find closest numbers approximately

I have a table like this: TableTest Col1 Col2 Col3 Col4 5 6 7 8 12 6 5 6 2 3.5 6 1 And I want to find the closest row ...
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1answer
413 views

Python & Pandas : (pymysql.err.OperationalError) (2003, “Can't connect to MySQL server on 'localhost' (timed out)”)

I'm writing a Python Script to store JSON data into MySQL Database. I used pandas to store into MySQL Database. I used two different modules (...
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1answer
1k views

Python & Pandas : TypeError: to_sql() got an unexpected keyword argument 'flavor'

I want to store JSON Data into MySQL Database using Python. I used dataframe of pandas. I found that ...
3
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1answer
36 views

How to find the values that never matched in a full join

Hello I have done this full join query: ...
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0answers
15 views

Qualitative prediction based off data containing mixed qualitative and quantitative values? [closed]

I'm trying to find a way to predict an integer value based off of an item's prior sale history and am inquiring for a starting point on how to approach this. The factors are as follows (Data Type in ...
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2answers
62 views

Mean across every several rows in pandas

I have a table of features and labels where each row has a time stamp. Labels are categorical. They go in a batch where one label repeats several times. Batches with the same label do not have a ...
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1answer
72 views

What algorithms can be used to derive matching rules between known matches in datasets?

Lets say I have two datasets with different column names except for a unique ID key Table 1 CSV ...
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1answer
116 views

What algorithm could be used to fuzzy merge multiple datasets?

Problem Description I have several tables that are related but do not share any unique key. I've come across this problem several times with customer data in separate source systems that needs to be ...
3
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1answer
616 views

What is the best way to read SQL dataset in to Tensorflow?

What is the best way to read SQL database in to Tensorflow? Currently, I am using Postgres on server and developed DL algorithm on Tensorflow using Jupyter Lab. How can I import data into Jupyter Lab ...
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0answers
175 views

Solving correlation and covariance with 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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0answers
114 views

How to pass database name as parameter to sql statement in python? [closed]

I have several SQL statements (update, delete, insert,...) in my Python code and all of them ...
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10answers
34k views

Why do people prefer Pandas to SQL?

I've been using SQL since 1996, so I may be biased. I've used MySQL and SQLite 3 extensively, but have also used Microsoft SQL Server and Oracle. The vast majority of the operations I've seen done ...
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0answers
92 views

Python-SQL database [closed]

There are two SQL databases in which one database contains user data and other database contains service data. Firstly, I am connecting the databases and fetching it on python.Based on the user data, ...
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1answer
149 views

How to use features when predicting aggregation?

Let's say I have to predict the total monthly sales of a store. I have the data in the following format: I don't think I can use this data directly for predicting the sales for a month, as in it's ...
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1answer
40 views

Call a SQL procedure, for each group by [closed]

I am trying to call a procedure for each group of data. For example, I have a list of customers and movie's features that they like. Is a relation one to many, I have many records for one specific ...
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1answer
183 views

Is there an analog to SQL's STRING_AGG (or FOR XML PATH) function in Python?

Asked this in SE but maybe this is too data-oriented so trying to post it here. I am trying to find the analog to the SQL function STRING_AGG so that I can concatenate across columns and rows of a ...
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3answers
13k views

Natural Language to SQL query

I have been working on developing a system "Converting Natural Language to SQL Query". I have read the answers from the similar questions, but was not able to get the information that I was looking ...
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0answers
57 views

How to Return Mean Response Values using dplyr and SQL Server R Services?

I'm working on a stored procedure in SQL Server that utilizes dplyr (which is installed) to obtain the mean of response values for the responses to a given study ID. The R script and stored procedure ...
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1answer
386 views

Most Efficient Post Processing with Python and Pandas

This question is about best practices for working in Pandas dataframes. Speed, ease of use, and memory consumed could all impact any answers you might have. I start by pulling a data set into a ...
4
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3answers
524 views

The right join for the right situation?

(Please pardon the pun in the question title.) I'm currently teaching an introductory class to data science. I understand the differences between a left join, a right join, an inner join and a full ...
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2answers
2k views

Is there a package for using SQL to manipulate Pandas dataframes in Python?

Rather than learn a new package/language, I'd like to use my existing SQL skills to manipulate pandas dataframes in Python. Does anyone know of a way to do this, or ...
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1answer
119 views

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 ...
4
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2answers
114 views

Seeking advice on database architecture — given my problem, what tools should I learn?

I'm a fairly experienced R user, but until now I haven't had a good reason to learn to use databases. Now I have a problem where I am dealing with model output that I need to save to disk, and then ...
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1answer
277 views

Data dashboard for SQL server database

I am working on developing a data dashboard / app for a Microsoft SQL database. Currently, I am developing the dashboard using Shiny and R. The app is mostly for exploratory analysis to allow people ...
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1answer
2k views

Spark: calculating percentage from a non-Int field

I have a spreadsheet of banking information and one of the goals is to find out the failure rate of an advertising campaign. I think I need to get a count of the total number of entries vs. the total ...
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1answer
73 views

How to visualize trending over geographical area?

I would like to visualize how a percentage evolves in time over a geographical area. In particular I have the percentage of products delivered in different regions and I want to show the weekly trend ...
2
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1answer
105 views

SQL Server and skip first n rows

I work for a fire and EMS dispatch agency in Florida. All of our apparatus have gps to record the longitude, latitude, timestamp, apparatus, speed, unit status and the incident number. The klaxon in ...
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2answers
853 views

Does SQL Server support the Poisson distribution?

I am trying to do some work that is primarily based in SQL Server. I cannot seem to find a native function to SQL that supports the Poisson distribution. Has anyone had success with applying Poisson ...
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0answers
16 views

Run queries against results of previously cached queries [closed]

I'm trying to find a tool or workflow that would allow a team to analysis data in multiple steps, where intermediate results are cached. (I'll assume that the raw data is in a relational database and ...
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5answers
8k views

Do modern R and/or Python libraries make SQL obsolete?

I work in an office where SQL Server is the backbone of everything we do, from data processing to cleaning to munging. My colleague specializes in writing complex functions and stored procedures to ...
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0answers
508 views

Spark SQL Pivot CrossTab functionality

I'm exploring spark sql, but struggling to find the optimal way to achieve something that looks like this below. You can imagine that the client side pivot grid displays the first 3 columns as ...
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3answers
1k views

Instead of one-hot encoding, can I store the same information in one column using a single value?

Rather than creating 15 additional columns full of sparse binary data, could I: 1) use the first 15 prime numbers as indexes for the 15 categories 2) store data by multiplying the prime numbers of ...
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1answer
73 views

Sql satament sql server [closed]

I want to know how to display those statement ( what the correct statement for them Display the name of the school that contain the maximum number of students For each school, display the number of ...
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1answer
109 views

How do I write a SQL (or dwSQL) query across these two different datasets?

I'm having a little fun and I'd love to know how to write a SQL or dwSQL query across these two datasets of Trumps tweets and Facebook posts. Here are the datasets: Trump Facebook Posts https://data....
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1answer
107 views

mysql could not recieve table from Citespace [closed]

I created was database through commands (see lower) ...