postgresql

问题 From Jupiter notebook, I was able to create Database with Psycopg2. But somehow I was not able to create Table and store element in it. import psycopg2 from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT con = psycopg2.connect("user=postgres password='abc'"); con.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT); cursor = con.cursor(); name_Database = "socialmedia"; sqlCreateDatabase = "create database "+name_Database+";" cursor.execute(sqlCreateDatabase); With the above code, I can see

问题 Can you give an idea? I have two tables in to postgresql DB. The are filled with recods by two separate csv files. But the records of the first csv file are with local timestamp. The second csv file is with timestamps UTC. So I need to change the time in local of the view in this table that is filled with records with timezone UTC. I used to deal with that problem before using laravel with this code in every page that I need to do that, for example: date_default_timezone_set('Europe/Sofia');

问题 I have two tables, which look like this (simplified): Operations: |operation_id|description|created_at| |------------|-----------|----------| | 1| abc|2020-04-04| Transactions |transaction_id|amount|created_at|user_id|operation_id|type| |--------------|------|----------|-------|------------|----| | 1| 400|2020-04-04| 1| 1| tr| | 2| 400|2020-04-04| 2| 1| tr| How can I find all operations in which transaction.user_id 's intersects with an array of user ids? E.g. for array [1, 2] there will be

问题 Am trying to convert below oracle query to postgres, MERGE INTO table1 g USING (SELECT distinct g.CDD , d.SGR from table2 g, table3 d where g.IDF = d.IDF) f ON (g.SGR = f.SGR and g.CDD = f.CDD) WHEN NOT MATCHED THEN INSERT (SGR, CDD) VALUES (f.SGR, f.CDD); I made changes as below compatible to postgres: WITH f AS ( SELECT distinct g.CDD , d.SGR from table2 g, table3 d where g.IDF = d.IDF ), upd AS ( update table1 g set SGR = f.SGR , CDD = f.CDD FROM f where g.SGR = f.SGR and g.CDD = f.CDD

问题 I want to delete all records with dates before 20 minutes ago. Postgres (or Sequelize) is not satisfied with the bare javascript Date object I provide as the comparison value. I'm using sequelize 4.37 on top of a postgres 9.6 database. The column in question was declared with type: Sequelize.DATE , which research suggests is equivalent to TIMESTAMP WITH TIME ZONE : a full date and time with microsecond precision and a timezone signifier. (That is also what I see when I use the psql CLI tool

问题 I am have created a class User that will hold the logic for inserting a new user into a postresql database. My code works perfectly but i think it is poorly written and would like some views on how to improve it, especially error handling. const pool = require('../config/config.js'); // user constructor class User { constructor(user) { this.username = user.username; this.email = user.email; this.password = user.password; this.role = user.role; } // save new user in databes createUser(res) {

问题 I have a Postgresql 11.8 table named posts where I would like to define a column slugs of type JSONB, which would contain arrays of strings such as ["my-first-post", "another-slug-for-my-first-post"] . I can find a post having a specific slug using the ? existence operator: SELECT * FROM posts WHERE slugs ? 'some-slug' . Each post is expected to only have a handful of slugs but the amount of posts is expected to grow. Considering the above query where some-slug could be any string: How can I

问题 I have two database tables "Users" and "Transactions" where the "Transactions" table looks like below. The "Transactions" table has a record of each transaction between two accounts where the differentiator is "senderAccount" and "recipientAccount" columns. id | transactionId | senderAccount | recipientAccount | Amount | —--+---------------+---------------+------------------+--------+ 1 | ijiej33 | A | B | 100 | The relationship between "Users" and "Transactions" is one to many since every

问题 I'm using Postgres 12. I have 2 files that I want to load into a table via COPY. However, I need the rows from each file to indicate their source. Is there some trick with COPY where I could specify a default value for a column? I can't use the DEFAULT mechanism on the table declaration itself since that'd be universal, not different per file. The only hack I've come up with so far is running the files through a pre-step to add the column to the raw file, but that's painful as I'm trying to

问题 When executing a SQL query on a Postgres database using the psql client, it nicely formats the results and displays them in a pager (by default). How to change this behavior to make psql display results as soon as they are available rather than waiting for the full result set to computed (in a larger computation)? Of course, aligned output cannot be expected in this case, because the width of the individual columns is not known before they are to be printed. 回答1: Not processing the full