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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9 views

How to change the authentication configuration of mysql connector to python? [closed]

I was trying to connect MySQL with python via the following code. ...
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5 views

How to change data source names in Google Data Studio

Google Data Studio has connectors to MySQL, PostgreSQL, etc. but these connections will come with default names. Couldn't find out how to set the names for data sources in Google Data Studio. Is it ...
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7 views

Generating prediction when adding new rows into a relational dataset

There is a PostgreSQL table that I regularly update with new book reviews. Meanwhile, I also have trained a Tensorflow model that takes book review text and return a predicted book review category (an ...
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1answer
28 views

Tools for a data science job [closed]

Could someone list out all the important tools and software required for a data science job? Example spark, tensorflow, SQL, tableau etc. It would be helpful if you could list the domain and then 2 ...
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3 views

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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20 views

Looking for a web based tool for natural language to PostgreSQL query for custom database

I need to build a web-based solution that will take a natural language query in English, convert it into an SQL query that I need to execute on a PostgreSQL database. I tried ln2sql/nl2sql but it only ...
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1answer
17 views

Get the average time between 1st and 2nd call (postgresql)

I have the following data in a table where I want to calculate the average time between 1st and 2nd call. I know how to get the average, but I have a tough time figuring out how to subtract the 2nd ...
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1answer
27 views

Running a query in R after establishing dbconnect

I do not seem to figure out what is wrong it the following statment. The connection to the DWH is establishe but the query statement in R seems not to work, with the following error : ...
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13 views

Manually rollbacking JDBC transaction or just leaving it to the database

When managing transactions through JDBC, should I manually rollback if some exception occurs or leave it to the database to do the rollback on its own? The database in question is Postgresql. As far ...
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1answer
60 views

Removing outliers with orders of magnitude differences

I have a dataset of virtual currency earn and spend events from a mobile game app. Unfortunately, people cheat in the game to get more currencies. These cheaters use different techniques so its quite ...
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1answer
11 views

Getting the earliest date (duplicates due to several call ids and agents)

I am trying to get the earliest call interaction, with only the agent that interacted at that call and the customer id. Using the following code, I still get duplicates: ...
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15 views

Natural Language to SQL Training Data for German Language

I need to train/implement a model that translates natural language questions in German into SQL queries. For supervised models, this means that a lot of training data is needed, which would be a ...
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2answers
134 views

How important is advanced SQL for data science?

Is advanced level SQL required to be competitive as a data scientist? Is it more important for a data analyst to be good in SQL? Is it enough to be able to extract data using simple SQL queries? I ...
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1answer
28 views

Storing and collecting data

I wanted to ask you which coding language I should use. I am pretty new in coding and could really use some help. As I mentioned above I want to create a survey and afterward store my results in a ...
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1answer
769 views

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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19 views

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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13 views

Getting transportation turnover as null when i filtered by Product nature [closed]

I am pretty new to SQL. When i tried the following query i am getting sum as 0. Can somebody explain me the problem of the query. ...
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0answers
38 views

SQL Oracle - Excel's BETAINV function (Inverse cumulative function of a beta distribution) in SQL Oracle [closed]

Is there a function equal to Excel's BETAINV(probability,alpha,beta,[A],[B]) in Oracle SQL Developer? Or a similar one which I could use to return the inverse cumulative distribution function of a ...
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1answer
22 views

How to group by ID, and output without repeating IDs? [closed]

Input UserID Profile 101 apple 102 banana 103 pie 101 banana 102 pine 103 berry Output ...
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1answer
67 views

Format of data in SQL for machine learning

I am a beginner at Machine Learning and am starting out on a ML project. I have a large chunk of the source material and have started extracting the data from it to be stored in SQL (initial test with ...
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1answer
26 views

Scraping mixed elements and passing to SQL

I'm running webscrapes via python which are retrieving data from csv's hosted on the web. I'd like to pass the data into a MSSQL database. An issue I have is the mixed elements/data types in the csv....
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1answer
864 views

How to plot time series data from SQLite database

I am trying to plot time series data by accessing the SQLite database. I successfully connect the database by coding the below script,however, i couldn't figure out how to plot the time series data ...
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1answer
85 views

SQL and JSON database - R

I have a database (PostgresSQL) which looks like this: ""results"": {""WEBS"": {""WEBS_4"": [{""ip"": ""XXXXX"", ""value"": ""YYYY""}]}} I would ...
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1answer
50 views

How to store subset of columns from a csv file?

I need to create a table in hive (or Impala) by reading from a csv file (named file.csv), ...
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0answers
122 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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1answer
44 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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1answer
28 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
321 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
528 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
43 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
76 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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1answer
30 views

Analyze additions and subtractions to/from a data set

I have a data set in the following form: ...
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2answers
41 views

Find closest numbers approximately

I have a table like this; all columns are numeric: TableTest Col1 Col2 Col3 Col4 5 6 7 8 12 6 5 6 2 3.5 6 1 And I want to ...
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1answer
2k 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
5k 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 ...
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1answer
50 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
17 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
1k 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
136 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
438 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 ...
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2answers
3k 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
391 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
331 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 ...
107
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11answers
62k 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
124 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
269 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
45 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
431 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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4answers
28k 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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1answer
646 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 ...