jet-columnid.md

description	title	TOCTitle	ms:assetid	ms:mtpsurl	ms:contentKeyID	ms.date	ms.topic	api_name	topic_type	api_type	api_location	ROBOTS
Learn more about: JET_COLUMNID	JET_COLUMNID	JET_COLUMNID	d6c74c5c-ba61-4e1c-a1b1-495e925b6b68	https://msdn.microsoft.com/library/Gg294104(v=EXCHG.10)	32765719	04/11/2016	reference		apiref kbArticle	COM		INDEX,FOLLOW

JET_COLUMNID

Applies to: Windows | Windows Server

JET_COLUMNID

The JET_COLUMNID data type identifies a column within a table.

    typedef unsigned long JET_COLUMNID;

Data Types

JET_COLUMNID

Identifies a column within a table.

Remarks

Column IDs are unique within a single table. Once a column is known to have a certain column ID, it will always have that column ID. Restore from backup will not change the value of a column ID. However, if one or more table columns, prior to a specific table column, are deleted, a compact database can then change the value of a column ID.

In some cases, column IDs are the only means of identifying columns. When a temporary table is created, its columns do not have names, but an array of column IDs is returned by the create function.

Columns in different tables can have the same column ID.

Requirements

Requirement	Value
Client	Requires Windows Vista, Windows XP, or Windows 2000 Professional.
Server	Requires Windows Server 2008, Windows Server 2003, or Windows 2000 Server.
Header	Declared in Esent.h.