import psycopg2 from psycopg2 import sql import datetime def connect(conn): “”” Connect to the PostgreSQL database server “”” # create a cursor cur = conn….
Tag: postgresql
postresql query to check no. of documents is 4
I have a master table for applications and another table for documents upload, I want the count of applications which has 4 documents in document table. master application table=>application_ht_install and Documents table=>bescom_appl_upload_doc ack_no is the primary key for application_ht_install and f…
Is NamedParameterJdbcTemplate vulnerable safe?
We are using NamedParameterJdbcTemplate to achieve “IN” operator functionality. Is there any SQL Injection vulnerability when we use NamedParameterJdbcTemplate? Answer Since NamedParameterJdbcTemplate internally use PreparedStatement for querying , and if you can make sure that you do not build th…
Postgresql query to filter latest data based on 2 columns
Table Structure First users table id 1 2 3 sites table id 1 2 site_memberships table site_id user_id created_on 1 1 1 1 1 2 1 1 3 2 1 1 2 1 2 1 2 2 1 2 3 Assuming higher the created_on number, latest the record Expected Output site_id user_id created_on 1 1 3 2 1 2 1
deleting all occurrences of a character before the next different character
In a postgres table I have a column with values like: I need to delete all 0 before the next character that is NOT a 0. So, the previous column will became: Is this possible in psql? Answer (No comment necessary.)
psycopg2 takes a value as a column
I’m trying to create a table using psycopg2 and then insert outer data from some jsons. For this reason I defined 2 function: create_words_table() and insert_data(): So, attempting to execute them: I got further error: Looking at documentation, I don’t see any mistake applying simple INSERT query …
How to deal with JSON column while using GROUP BY
I’m using a query similar to the below one, address is JSON TYPE. But getting below error: I’m trying to get the data of a person who has the max salary for his age and I need to include adress filed which should be JSON So, Is the there any way to achieve this or is this practically possible ?
Follow the connections : recursive query
i have two columns of numbers. the goal is starting from a number f.e. 55, to extract all ‘connected’ numbers (starting with any of those numbers, should yield the same result) in this case all numbers shown here : 55,56,35,69,60,22,47,2,26 I use the following query : but I get back only those bac…
How do I update row in postgessql to ignore error?
I am trying to update thousands of rows in my table in postgres but I am getting a user does not exist error, hence my table is not updating. How do I update the rows in table to ignore any errors where a user does not exist in the user table If for example userid=3 does not exist, how do
INNER JOIN and Count POSTGRESQL
I am learning postgresql and Inner join I have following table. Employee Department I want to query to return the Department Name and numbers of employee in each department. I dont know what I did wrong as I am new to database Query. Answer When involving all rows or major parts of the “many” tabl…