数据库创建
DROP DATABASE IF EXISTS `sql_invoicing`;
CREATE DATABASE `sql_invoicing`;
USE `sql_invoicing`;
SET NAMES utf8 ;
SET character_set_client = utf8mb4 ;
CREATE TABLE...
问题:
I have three main constraints for int8 key generation:
Keys need be unpredictably random
Number of rows created should not be calculable
Order of row c...
问题:
Are Postgres SELECT DISTINCT queries deterministic?
Will SELECT DISTINCT somecolumn FROM sometable return the same result (including order) if the table (and entire data...
问题:
Considering following peewee backed python code, how to filter data in a table based on values across rows in another table
e.g. if I want to get a note in Note table hav...
问题:
I have working with Relational Databases for a while but I'm pretty new with PostgreSQL and handling Jsons in dbs. I have the following example:
CREATE TEMPORARY TABLE IF...
问题:
My database contains 'n' number of columns.
For example:
Name city phone number ..............,
Exactly I don't know about the total number of columns and name...
问题:
I need to create a list of the 2 rating hotels in the UK that have increased their rating by at least 3 points from the beginning.
Month | Hotel | Rating | Region |...