I am using Postgres 9.5. If I update some values of a row and submit them, is there a way to get the old values later? I was wondering if there is something like flashback? But this will be a s
Category: Database
The database is a warehouse that organizes, stores and manages data according to the data structure. It was created more than 60 years ago. With the development of information technology and the market, especially after the 1990s, data management is no longer just It is to store and manage data, and transform it into various data management methods required by users. There are many types of databases, from the simplest tables that store various data to large-scale database systems that can store massive amounts of data. They have been widely used in all aspects.
PowerDesigner creates a database table and exports SQL
I recently accepted a new project. The project structure uses jdbc to connect to the database, and the database uses orcal. I used to use hibernate to automatically generate tables. Now I have to d
Neo4j preliminary understanding and use
Introduction Graph Database is a special existence in the NoSQL database family, used to store rich relational data. Neo4j is currently the most popular graph database and supports complete transac
PowerDesigner prompts to install the printer
Question:
PowerDesigner will open every function Prompt to install the printer is very damning
Solution:
Just turn on this printer service
Question:
PowerDesigner will
Windows tools for analyzing PostgreSQL log files
I activated log_duration in the PostgreSQL configuration in order to find the most expensive query.
Now I am looking for a tool (Windows) that enables I can analyze the generated log files. C
What is the NOSQL database, the difference between NOSQL and SQL
NoSQL database is optimized for scalable performance and architectureless data model Non-relational database.
NoSQL databases are also widely recognized for their ease of development, low lat
PostgreSQL creation view
I have the following columns in Form A. They record user fingerprint “transactions” every time they register or check out from the building.
CREATE TABLE user_transactions(
id serial P
PowerDesigner generates Java code
Use the powerDesigner tool to draw the class diagram, and then let it generate java code
Use the powerDesigner tool to draw the class diagram, and then let it generate java code
NOSQL Database Modeling Tool
I know that most of the time NOSQL databases are schemaless, or at least have a flexible database schema.
However, the basic model needs to be modeled in advance and may be developed later. So in
PostgreSQL – Postgres – Calculation of cumulative data
I collect data from some API sources through Python and add it to 2 tables in Postgres.
Then, I use this data To generate reports, join and group/filter data. I add thousands of rows every da