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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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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1 answer
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Missing statement in the below MYSQL query

I have 3 tables with columns likes- ...
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Get the average wait time for successful sessions & unsuccessful sessions using SQL

RISE On Demand is a call center application on Microsoft Teams. Customers can initiate online meetings through the company’s website where they can connect with agents to resolve their queries/issues....
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Power BI: Selecting a column based on a value in another table

In a database, there are two tables... examples as follows: table_1: CAGDP9_1 CAGDP9_2 ##### ##### linecode_description_table: linecode description CAGDP9_1 desc here Suppose I am searching for ...
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Equivalent of Presto's 'histogram' function in Azure SQL

I want to get an equivalent function to Presto's 'histogram' which just aggregates counts into a histogram like json, e.g if I have a table called table that looks ...
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2 answers
15 views

SQL, count total users' first order for each region, each day

I have a table called orders. Link for the table here: table I want to get the total users' first order in each region, each day. First, I tried to get the first order for each unique user by doing ...
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1 answer
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Python-SQL-Excel : When to use them?

I am currently learning data science and learned already a lot of Python not just for data science, also for script writing, web scraping etc. Meanwhile i started to look for how people actually earn ...
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How do you publish the direct returned dataset from a SQL server stored procedure inside Power BI instead of using that dataset to populate a report?

I have a sql server stored procedure that return a dataset with very specific ORDER BY parameters. I can import that dataset into Power BI properly, but when I go to create a report using that dataset,...
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1 answer
59 views

Convert This Sql Query into Python pandas Code [closed]

Can help me to solve it with python pandas i don't need any help from python libraries i need code of python Thx so much more for helping me
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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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11 views

SQL Code for Azure ML Studio

I have a csv file named 'bikebuyers' in which there is only one sheet named 'bibus'. In this sheet, there are 19 columns and 1001 rows. The last column is my dependent variable named 'Purchased Bike' ...
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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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Computing number of business days between start/end columns

I have two Dataframes facts: columns: data, start_date and end_date holidays: column: <...
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Has anyone joined FHIR resources?

I have FHIR-formatted data (Fast Healthcare Interoperability Resources), that I've converted to CSV using the npm package ndjson-to-csv, and on first glance, this seems useable for ML experimentation, ...
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2 answers
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How to generate test set with no data-leakage using multiple columns

I am developing a fraud detection algorithm. Among other things, my dataset contains the phone number, email address and a few other fields that should uniquely identify a user (let's call them "...
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5 votes
1 answer
280 views

Data engineering good and bad practice?

I'm a Data Analyst in a pretty big company and I'm having a really bad time with the data I'm being given. I spend about 70% of my time thinking about where to find the data and how to pull it instead ...
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1 answer
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Applied and view jobs ratio

I have the following data set where the column "kind" can be V(view) or A(apply), how can I do the following things given a particular job id how many applicant Apply (A) to that particular ...
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1 answer
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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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Join 2 columns from the same table into a new column but in seperate rows [closed]

I need to find customers that have multiple applications registered. I have done a self join and used "WITH" to make it run faster but i also had to use OUTER APPLY STRING_SPLIT function as ...
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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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1 answer
48 views

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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1 vote
2 answers
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How can I create a table from an existing table in SQL but using cells from the old table as columns in the new table? [closed]

I have a table, and I want to create a new table such as the one below (from the table above) In SQL, I tried using the following commands. I am able to generate a table with only one column like ...
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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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Create an amortization table with SQL [closed]

I have a list of credits, let's assume they are only two for ease: Credit #1 and credit #2: One has 3 months of payments missing and the other has 6 months left of payments. It would like to obtain a ...
1 vote
1 answer
35 views

Optimization technique for iterative distribution

Apologies if this does not fit the proper format for this site, as it is a somewhat general question. I have an application that sits on top of a SQL database, and need to handle a process which is ...
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1 answer
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query category wise dara

I have stored the some products and there respective category in sql. Like this. Now I want fetch all product from table with respective category. output should be=>
2 votes
1 answer
2k 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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-1 votes
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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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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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1 vote
1 answer
670 views

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

I have the following data in 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 though time to figure out how to subtract the 2nd ...
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1 answer
325 views

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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1 vote
1 answer
276 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 ...
0 votes
1 answer
12 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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7 votes
2 answers
372 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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2 votes
1 answer
43 views

Storing and collecting data [closed]

I wanted to ask you which coding language I should use. I am pretty new to coding and could really use some help. As I mentioned above I want to create a survey and afterward store my results in a ...
1 vote
1 answer
4k 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 ...
1 vote
0 answers
26 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 ...
1 vote
0 answers
14 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. ...
1 vote
0 answers
80 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 ...
1 vote
1 answer
29 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 ...
2 votes
1 answer
96 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 ...
1 vote
1 answer
28 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....
1 vote
1 answer
3k 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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1 vote
1 answer
194 views

SQL and JSON database - R

I have a database (PostgresSQL) which looks like this: ...
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1 answer
136 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), ...
1 vote
0 answers
205 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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1 answer
51 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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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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1 vote
1 answer
358 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-...