Friday, January 17, 2025

How do you list all fields from one table in MySQL?

 To list all fields (columns) from a table in MySQL, you can use one of the following methods:

1. Using DESCRIBE or EXPLAIN Statement

DESCRIBE table_name;

or

EXPLAIN table_name;

This will provide details about each column in the table, including its name, data type, whether it allows NULL, and other information.


2. Using SHOW COLUMNS Statement

SHOW COLUMNS FROM table_name;

This will return the column names along with their types, nullability, key information, default values, and extra information.


3. Querying the Information Schema

The INFORMATION_SCHEMA.COLUMNS table contains metadata about all columns in the database.

To get just the column names for a specific table:

SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'table_name'
  AND TABLE_SCHEMA = 'database_name';

Replace table_name with the name of your table and database_name with the name of your database.


Choosing the Right Method

  • For a quick overview, use DESCRIBE or SHOW COLUMNS.
  • For more flexibility (e.g., filtering by schema or table name), use the INFORMATION_SCHEMA.COLUMNS query.

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