I am currently working on a project to build a database on professor’s research paper database. This is my first time building a database(never had experience with MYSQL) and I am learning as I am doing it. I was able to use an api to get the data, for example: {“authorId”: “1773022…
Tag: python
PySpark: Adding elements from python list into spark.sql() statement
have list in python that is used throughout my code: I also have have a simple spark.sql() line that I need to execute: I want to replace the list of elements in the spark.sql() statment with the python list so that that last line in the SQL is I am aware of using {} and str.format but I am struggling
using python I’m trying to insert ADMIN_ID as None in to a database in SQL and my date_time that converted into a suitable format into a table
this works but i cant seem to get the other format to work i know that the date_time will work becasue ive already tested it on its own in a another database but i can seem to get this one to work InterfaceError: Error binding parameter :EXPIRE – probably unsupported type. Answer Use the following: [dat…
Psycopg2 connection sql database to pandas dataframe
I am working on a project where I am using psycopg2 connection to fetch the data from the database like this, Now after getting the data from the table, I am running some extra operations to convert the data from cursor to pandas dataframe. I am looking for some library or some more robust way to convert the …
Idempotent record creation: is it better to use a unique constraint or check for existence before inserting a record?
I’ve recently been wondering what’s generally the best approach for ensuring that the creation of database records is idempotent. The two approaches I can think of are: Checking whether a record already exists before executing an INSERT Using a unique constraint on the relevant columns to insure t…
Is it possible to delete last n records of a django model in one/minimum database query?
I’m trying to delete last 10 records of Task table/model in django but I’m unable to do that in one query. Above code gives me error AttributeError : ‘list’ object has no attribute ‘delete’. If I make a loop and then use .delete() on each object of that list then it will ca…
How to update rows and then delete all but one. Data deduplication
Given a table like this: ID A B C D 01 3 2 1 0 01 5 2 1 0 01 0 2 1 0 00 4 8 1 1 00 4 8 1 1 00 4 8 1 1 03 6 4 0 0 03 0 2 0 0 03 6 4 0 0 How could I use SQL
Python(Flask,JayDeBeApi) RuntimeError: No matching overloads found for prepareStatement
as mentioned in the title i get this error when i try to execute a prepared statement. The full error is: As far as i can understand is, that propably that since i am trying to use a prepared statement, that the compiler can not find something to overload the ? placeholder. Code snippet: The error seems to ha…
How to call a complex SQL query in python
I have the following SQL code: This SQL code has been tested and runs perfectly on SQL Server Management Studio. Now I have the following code for python which is to communicate with an MS SQL Server instance: When I run it, I get the following error where it points to the first semicolon in my code. Could yo…
Iterating through a list Python SQL
I’m trying to search a database, by iterating through a list of search values. I’m almost there as this works for integers but not strings. The code below won’t work, but if I replace the list values with numbers it does: Answer It’s because you have to enclose strings in quotation mar…