QuestDB installation and use

QuestDB is a high-performance, open-source temporal database that focuses on processing real-time data. It supports SQL queries and insert operations, and has the characteristics of low latency and high throughput. The process of installing QuestDB is as follows: 1. On the official website of QuestDB（ https://questdb.io/ ）Download a compressed package file suitable for your operating system. 2. Extract the downloaded files into a directory. 3. Run the questdb.sh (Unix) or questdb.bat (Windows) script file to start QuestDB. 4. Open the browser and access http://localhost:9000 You will see the web interface of QuestDB. Next is the creation of the database and the operation of adding, deleting, modifying, and querying data: 1. Create a database: -In the query editor of the web interface, enter the following SQL statement to create the database: sql CREATE DATABASE mydb -Click the 'Run' button and the database will be created. 2. Create Table: -In the query editor of the web interface, enter the following SQL statement to create a table: sql CREATE TABLE mytable ( timestamp TIMESTAMP, value DOUBLE ) -Click the 'Run' button and the table will be created. 3. Insert data: -In the query editor of the web interface, enter the following SQL statement to insert data: sql INSERT INTO mytable (timestamp, value) VALUES ('2022-01-01T00:00:00', 10.5) -Click the 'Run' button and the data will be inserted. 4. Query data: -In the query editor of the web interface, enter the following SQL statement to query the data: sql SELECT * FROM mytable -Click on the "Run" button and the query results will be displayed. 5. Update data: -In the query editor of the web interface, enter the following SQL statement to update the data: sql UPDATE mytable SET value = 12.5 WHERE timestamp = '2022-01-01T00:00:00' -Click the 'Run' button and the data will be updated. 6. Delete data: -In the query editor of the web interface, enter the following SQL statement to delete data: sql DELETE FROM mytable WHERE timestamp = '2022-01-01T00:00:00' -Click the 'Run' button and the data will be deleted. Through the above steps, you can successfully install QuestDB and create a database, as well as add, delete, modify, and query data. You can modify SQL statements and perform different operations as needed.