Table: Link
This table stores information about links to external documents.
Columns
Name	Type	Constraints	Description
link_KEY	int	NOT NULL	Assigned by COMMON_dp_Allocate_Unique_Identifiers. Primary key of this table
link_group_KEY	int	NOT NULL	Parent group of this link
description	nvarchar (260)	NOT NULL	User-configurable name of this link
sort	int	NOT NULL	A value indicating what order to sort items in
link_type_KEY	int	NOT NULL	Type of link this is
target	nvarchar (2048)	NOT NULL	The information used to resolve the link. Depending on the link_type_KEY, this column can store a file system location, an URI, a GoFileRoom document ID, a FileCabinet item ID, etc.
comment	nvarchar (-1)	NOT NULL	Optional reason why this link was created
create_machine_name	nvarchar (50)	NOT NULL	Machine name of the machine on which this link was created
create__staff_KEY	int	NOT NULL	Key of Staff who created this row.
update__staff_KEY	int	NOT NULL
create__changeset_KEY	int	NOT NULL
update__changeset_KEY	int	NOT NULL

Primary key
Name	Columns		Description
PK_Link$link_KEY	link_KEY		CLUSTERED
Unique constraints
Name	Columns		Description
UK_Link$link_group_KEY$description	link_group_KEY, description		Each link in a particular link group must have an unique description.
Indexes
Name	Columns		Description
IX_Link$link_type_KEY	link_type_KEY		Index supports foreign key FK_Link__Link_Type__link_type_KEY

Foreign keys
Name	Columns	Referenced table	Description
FK_Link__Link_Group__link_group_KEY	link_group_KEY	Link_Group

Incoming foreign keys
Name	Columns	Referencing table	Description
FK_Interaction_Link__Link__link_KEY	link_KEY	Interaction_Link