mysql query all tables

MySQL is an open source relational database management system that is widely used in various web applications because it is highly customizable and easy to manage. MySQL contains a set of operations that allow you to create, update, and query data in your database. One of the important operations is to query the data of all tables. This article will introduce how to achieve this operation.

1. Use the SHOW TABLES command

The SHOW TABLES command is the simplest and most direct way to query all tables. It will display the list of all tables present in the database. Using this command, you can instantly know the number of tables contained in each database.

The following are the steps to query all tables using the SHOW TABLES command:

1. Open the MySQL console or connect to the database server through the MySQL command line tool.
2. Select the database to query. Enter one of the following commands:

USE database_name;

Remember that database_name must be replaced with the name of the actual database you want to query.

3. Use the SHOW TABLES command. Enter the following command:

SHOW TABLES;

This command will display a list of all tables contained in the selected database.

2. Use INFORMATION_SCHEMA

MySQL also provides a more advanced method to query data in all tables, namely INFORMATION_SCHEMA. This method provides a more detailed and flexible database search, allowing you to select specific columns, filter and sort results, etc.

The following are the steps to query all tables using INFORMATION_SCHEMA:

1. Open the MySQL console or connect to the database server through the MySQL command line tool.
2. Select the database to query. Enter one of the following commands:

USE database_name;

Remember that database_name must be replaced with the name of the actual database you want to query.

3. Use the SELECT statement and call the INFORMATION_SCHEMA.TABLES table. Enter the following command:

SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'database_name';

Remember that database_name must be replaced with the name of the actual database you want to query.

This command will return the names of all tables contained in the selected database.

3. Summary

The above are two methods of querying all tables in MySQL. The SHOW TABLES command provides a quick and easy way to list all tables, while INFORMATION_SCHEMA is more powerful, providing more search options and listing of detailed information. Depending on your needs, you can choose between these two methods and tailor the results to your specific query needs.

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