query to list all columns in SQL code example

Example 1: get table columns from sql

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = N'Customers' 
-- INFORMATION_SCHEMA is an ANSI-standard (American National Standard Institute) set of read-only views which provide information about all of the tables, views, columns, and procedures in a database
-- "N" defines the subsequent string (the string after the N) as being in unicode

Example 2: get all columns from table sql

SELECT
  	TABLE_NAME
FROM
  	INFORMATION_SCHEMA.TABLES

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