# 1.3.3 - Terraform Variables

Youtube Video | \~24 min

{% embed url="<https://www.youtube.com/watch?v=PBi0hHjLftk&list=PL3MmuxUbc_hJed7dXYoJw8DoCuVHhGEQb&index=13&pp=iAQB>" %}
<https://www.youtube.com/watch?v=PBi0hHjLftk&list=PL3MmuxUbc_hJed7dXYoJw8DoCuVHhGEQb&index=13&pp=iAQB>
{% endembed %}

:writing\_hand: In this video we will continue talking about terraform main.tf and now variable.tf. We will also learn about Big Query Datasets and using function file().

### Terraform Big Query Dataset

{% embed url="<https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/bigquery_dataset#example-usage---bigquery-dataset-basic>" %}
<https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/bigquery_dataset#example-usage---bigquery-dataset-basic>
{% endembed %}

#### Main.tf

Append info to our previous `main.tf` from 1.3.2

```bash
resource "google_bigquery_dataset" "demo_dataset" {
  dataset_id = "example-dataset"
}
```

:black\_medium\_square: Terminal run `terraform apply`, because we changed our `main.tf` file. You can now see this added into GCP.

#### Variables.tf

```bash
variable "bq_dataset_name" {
  description = "My BigQuery Dataset Name"
  #Update the below to what you want your dataset to be called
  default     = "demo_dataset"
}
```

To use your `variables.tf`, we will need to modify the `main.tf`

```bash
resource "google_bigquery_dataset" "demo_dataset" {
  dataset_id = var.bq_dataset_name
  location   = var.location
}
```

Another example you cn add is **using function file()** in your `variables.tf` scripts

```bash
variable "credentials" {
  description = "My Credentials"
  default     = "<Path to your Service Account json file>"
  #ex: if you have a directory where this file is called keys with your service account json file
  #saved there as my-creds.json you could use default = "./keys/my-creds.json"
}
```

### Resources

Full terraform code here:

{% @github-files/github-code-block url="<https://github.com/Tinker0425/de-zoomcamp-my-work/tree/master/module-01/terraform>" %}

:link:  <https://registry.terraform.io/>


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