Postgresql – How to update all the value from one column to another
Table 1 - col1 col2 1 443 2 449 3 479 Table 2 - col1 col2 1 NULL 2 NULL 3 NULL Note - col1 is not a PK expected Output - Table 2 - col1 col2 1 443 2…
Postgresql – Trouble hooking up postgres to django
Following the documentation from Django Postgres DocumentationI added to my settings.py in settings I set DATABASES = { 'default': { 'ENGINE': 'django.db.backends.postgresql', 'OPTIONS': { 'service': 'my_service', 'passfile': '.my_pgpass', }, } } Adjacent to settings.py I created pg_service.conf with [my_service] host=localhost…
How exactly streaming data to PostgreSQL through STDIN works?
Let's say I am using COPY to stream data into my database. COPY some_table FROM STDIN I noticed that AFTER stream had finished, database needs significant amount of time to process this data and input these variables into the table.…
Postgresql – SQL-How would I acess this data using SQL in superset
I have a field in my table as shown below. I want to create a bar chart for all choices by counting the ratings of each activity. I.e a very useful count for a newsletter, weekly tips, and other activities…
What will be the PreparedStatements for the below PostgreSQL table?
I want to use JDBC for preparedStatement in Java for inserting data into a PostgreSQL database. I have the following DDL CREATE SEQUENCE serial_no; CREATE TABLE distributors ( did DECIMAL(3) DEFAULT NEXTVAL('serial_no'), dname VARCHAR(40) DEFAULT 'lusofilms' ); I want to…
how to split rows into multiple rows based on values in an array column in postgresql? (see example in description)
i a have postgresql query that gets results like this: id | arrayElements 0 | [0, 2, 1] 1 | [0, 3] 2 | [1] In the above example the values inside arrayElements means something. I want to split this…
Postgresql – How to return json formatted results for join query in postgres
I have this existing query: SELECT to_json(table1) FROM table1 To return all of table in a nice json format. I need to add a join to this query, so my new query looks something like this: SELECT (field1, field2, table2field1)…
Postgresql – Rails/SQL – How to find users who does not have premium subscription with joins
I have two models User and Subscription as follows class User < ApplicationRecord has_many :subscriptions end class Subscription < ApplicationRecord belongs_to :user # attributes # name string # premium boolean # ... end Users will be having many subscription. How…
Postgresql – Multi-conditions data filtering involving BOOLEAN columns
I am lost in trying to filter data from a table containing BOOLEAN columns, where the filtering conditions apply some further consideration on one of the BOOLEAN columns. I explain my question with example below, reproduced in this db-fiddle. CREATE…
Postgresql – Convert method won't work when I'm trying to convert string variables to numeric & DateTime types (Npgsql Parameters)
So, I am using C#/.NET and am using Npgsql. Basically, I keep running into the error System.InvalidCastException: 'Can't write CLR type System.String with handler type NumericHandler' and I can't seem to resolve it. The error seems pretty self-explanatory. Basically, I'm…