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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1answer
20 views

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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1answer
21 views

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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6 views

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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14 views

Develop a Scorecard Model with Orange 3.30

I'm a super fan user of Orange 3.30, actually I've beeing develop some Collection Strategys and some othe of CLI in my actuall work, and everything has been OK with all the decisions that I've being ...
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22 views

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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0answers
20 views

Spark Dataframe APIs vs Spark SQL

I have a relatively complex query which runs against a database and contains multiple join statements, lead/lag functions, subquery, etc. These tables are available as individual files in my object ...
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0answers
17 views

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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26 views

SQL/Rails DISTINCT ON in Tableau

I have some practitioners in different states with different certifications setting availability (records with start and end dates), and I want to see the total availability grouped by states and ...
0
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1answer
23 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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2answers
33 views

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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31 views

How to calculate date range constrained average Lifetime Value within Data Studio?

So within a data studio dashboard, I have a number of metrics e.g. Total Orders, Total Sales, Average order value etc. with YoY indicators as shown below: And all the metrics are working fine with ...
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33 views

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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8 views

Merging and deduplicating mass amounts of data in ORC on a 24 hour interval

I have the following problem I'm looking to ideate on and looking for advice on how to think about it from a data science perspective. I'll keep the numbers small for simplicity. Day 1 I get 100 ...
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0answers
20 views

Database modelling

I'm trying to model a database for Disney+ shows, but I'm stuck at this part where I need to be able to model in a way such that Disney will be able to create a list of top 10 movies every week based ...
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0answers
67 views

Working with mySQL and pytorch Dataset

I am working with high frequency time indexed data. We have 2 types of data each with about 5 columns. For each type of data we have 2500 streams coming in and being updated every 1ms-100ms (the ...
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0answers
32 views

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 ...
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0answers
11 views

Restriction inside a que

There's a way to use information of one column as restriction for where in the same query? Picture that: I have my user_table like so: user_id name age gender lvl ...
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62 views

Why does a simple query succeed in mysql but fail in druid?

I have a mysql database table with only one column called __time which stores a time stamp. The following query works perfectly and will return the ...
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1answer
29 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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1answer
17 views

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=>
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1answer
606 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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1answer
45 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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0answers
5 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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1answer
99 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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1answer
165 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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1answer
162 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
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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2answers
327 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 ...
2
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1answer
40 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 ...
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1answer
3k 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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0answers
23 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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0answers
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. ...
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0answers
64 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 ...
2
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1answer
85 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
27 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
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1answer
2k 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
167 views

SQL and JSON database - R

I have a database (PostgresSQL) which looks like this: ...
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1answer
108 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
179 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
47 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
30 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 ...
1
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1answer
348 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-...
4
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2answers
1k 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 ...
5
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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 ...
4
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4answers
85 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 ...
2
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1answer
45 views

Analyze additions and subtractions to/from a data set

I have a data set in the following form: ...
2
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2answers
42 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
3k 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 (...
5
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1answer
7k 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 ...