psycopg2 sql.SQL: Composed elements must be Composable

import psycopg2 from psycopg2 import sql import datetime def connect(conn): “”” Connect to the PostgreSQL database server “”” # create a cursor cur = conn….

Only show rows in a table if something changed in previous row

I have a table with a lot of records (6+ million) but most of the rows per ID are all the same. Example: Row Date ID Col1 Col2 Col3 Col4 Col5 1 01-01-2021 1 a b c d e 2 02-01-2021 1 a b c d x 3 03-…

String table name not working in a query with psycopg2

I would like to generate dynamic queries with variables for column names and table name. This is my code: query = sql.SQL(“select {fields} from {table}”).format(fields=sql.SQL(‘,’).join([ …

PYTHON – Dynamically update multiple columns using a custom MariaDB connector

While reading this question: SQL Multiple Updates vs single Update performance I was wondering how could I dynamically implement an update for several variables at the same time using a connector like …

How do i create a MYSQL database locally using Database folder downloaded from github

I know the above question is incomplete. Let me explain this in brief. I downloaded the repository from this github link https://github.com/datacharmer/test_db and as per instructions on readme file i …

How to get the most liked users on a particular date in django

So I have a social media app, where users can like the posts of other users. Now I fetch the top 20 users who have received the most number of likes. Everything is perfect. But the problem is I cant …

Join pandas dataframes based on different conditions

I´m using Pandas in Python and I’d like to join 2 dataframes. My first dataframe is: id var date 1 ABCD 2019-01-01 1 ABCD 2017-06-01 1 ABCD 2016-06-01 2 ABCD 2016-01-01 The dataframe I want to …

Why can’t I loop through and drop databases?

There is a scenario where I want to go through and remove all databases that have specific text in the database name. It always drops one database and then does nothing. How can I fix this? def …

Django complex partitioning & ordering for tree Table

I’m using Django with PostgreSQL as my Backend-Stack for an application of which the main feature is a complex, multilevel table displaying annotated time-series-data for different products. So …

How do I update my stock database to reduce itself once a customer orders

Time to ask from the almighty stack overflow questions again. So my problem is that I am developing in TKINTER and have implemented and integrated 2 tables in one database on the application. I would …