> For the complete documentation index, see [llms.txt](https://gchandra.gitbook.io/data-warehousing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gchandra.gitbook.io/data-warehousing/rdbms/data-model.md).

# Data Model

**Data Models:** Is used to define how the logical structure of a database is modeled.

**Entity:** A Database entity is a thing, person, place, unit, object, or any item about which the data should be captured and stored in properties, workflow, and tables.

**Attributes:** Properties of Entity.

Example:

```
Entity: Student

​Attributes: id, name, join date
```

**Student**

| student id | name           | join date  |
| ---------- | -------------- | ---------- |
| 101        | Rachel Green   | 2000-05-01 |
| 201        | Joey Tribianni | 1998-07-05 |
| 301        | Monica Geller  | 1999-12-14 |
| 401        | Cosmo Kramer   | 2001-06-05 |