SQL COLUMN Keyword

 In SQL, the COLUMN keyword is often used in various contexts, but it's not a standalone keyword for any specific operation. It usually appears in the context of altering or describing a table. Here are a few common scenarios where the COLUMN keyword might be used:

1. ALTER TABLE to Add or Modify a Column

The COLUMN keyword is used when adding or modifying columns in an existing table.

• Add a column:

  ALTER TABLE table_name
  ADD COLUMN column_name datatype;
  

• Modify a column:

  ALTER TABLE table_name
  MODIFY COLUMN column_name new_datatype;
  

• Drop a column:

  ALTER TABLE table_name
  DROP COLUMN column_name;
  

2. DESCRIBE or SHOW Columns of a Table

The COLUMN keyword is not explicitly used in the command but is part of the function to describe table columns.

• Describe a table's structure (MySQL, MariaDB):

  DESCRIBE table_name;
  

• Show columns in a table (MySQL, MariaDB):

  SHOW COLUMNS FROM table_name;
  

3. SELECT Columns

When selecting data, the COLUMN keyword is not used, but you are selecting columns from a table:

SELECT column_name FROM table_name;

If you're referring to something specific, feel free to clarify!