# How do I create dependencies between models?

When you use the `ref` [function](../../reference/dbt-jinja-functions/ref.md), dbt automatically infers the dependencies between models.

For example, consider a model, `customer_orders`, like so:

models/customer\_orders.sql

```sql
select
    customer_id,
    min(order_date) as first_order_date,
    max(order_date) as most_recent_order_date,
    count(order_id) as number_of_orders
from {{ ref('stg_orders') }}
group by 1
```

**There's no need to explicitly define these dependencies.** dbt will understand that the `stg_orders` model needs to be built before the above model (`customer_orders`). When you execute `dbt run`, you will see these being built in order:

```txt
$ dbt run
Running with dbt=1.9.0
Found 2 models, 28 data tests, 0 snapshots, 0 analyses, 130 macros, 0 operations, 0 seed files, 3 sources

11:42:52 | Concurrency: 8 threads (target='dev_snowflake')
11:42:52 |
11:42:52 | 1 of 2 START sql view model dbt_claire.stg_jaffle_shop__orders ....... [RUN]
11:42:55 | 1 of 2 OK created sql view model dbt_claire.stg_jaffle_shop__orders .. [CREATE VIEW in 2.50s]
11:42:55 | 2 of 2 START sql view model dbt_claire.customer_orders .............. [RUN]
11:42:56 | 2 of 2 OK created sql view model dbt_claire.customer_orders ......... [CREATE VIEW in 0.60s]
11:42:56 | Finished running 2 view models in 15.13s.


Done. PASS=2 WARN=0 ERROR=0 SKIP=0 TOTAL=2
```

To learn more about building a dbt project, we recommend you complete the [quickstart guide](../../guides.md).

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