Table: Entity
Columns
Name | Type | Constraints | Description
entity_KEY | int | NOT NULL | AUTO-INCREMENT: Database assigned primary key for this table
update__staff_KEY | int | NOT NULL |
update_date | datetime | NOT NULL |
entity_id | nvarchar (11) | NOT NULL | User defined identifier (unique).
description | nvarchar (30) | NOT NULL | User Defined description
create_date | datetime | NOT NULL |
entity_id_sortable | varchar (48) | NOT NULL | A representation of the entity_id column that sorts in natural order, meaning that digits are sorted as numbers while non-digits are sorted alphabetically. A trigger keeps this field synchronized with the content of entity_id.

Primary key
Name | Columns | Description
PK_Entity$entity_KEY | entity_KEY | CLUSTERED
Unique constraints
Name | Columns | Description
UK_Entity__entity_id | entity_id | Each id must be unique.
UK_Entity__entity_id_sortable | entity_id_sortable | An index by the sortable ID is desired, and the algorithm ends up producing unique values.

Incoming foreign keys
Name | Columns | Referencing table | Description
FK_Client__Entity__entity_KEY | entity_KEY | Client |
FK_Project_Template_Entity__Entity__entity_KEY | entity_KEY | Project_Template_Entity |