How to view the quantity of data in a database table?

One way to check the data volume of a database table is by using the following methods:

1. Using SQL query: By using the COUNT function, you can count the number of records in a table. For example, in MySQL database, you can use the following query to view the number of records in a table:

SELECT COUNT(*) FROM table_name;

The table_name is the name of the table to be queried.

1. Using a database management tool: Most database management tools provide a way to view the data volume of tables. For example, in MySQL Workbench, you can open the detailed information of a table, which includes the number of rows in the table.
2. Different database management systems offer various system tables or views to store metadata information about databases and tables. By querying these system tables or views, you can retrieve data about the size of tables. For example, in MySQL, you can query the TABLES table in the information_schema database to access information about the number of rows in a table.

Using SQL queries to calculate the data volume of a table may put a certain load on the database, especially for large tables. Therefore, in a production environment, it is better to use database management tools or system tables/views to view the data volume of the table.