> ## Documentation Index
> Fetch the complete documentation index at: https://docs.morph-data.io/llms.txt
> Use this file to discover all available pages before exploring further.
# Variables
You can utilize values entered by users from the UI in SQL and Python processes in data applications.
* When using the `load_data` function to chain processes, all variables are passed to all processes.
* Variables can be passed to SQL and Python from MDX using the `defineState` argument as shown below.
```tsx theme={"dark"}
import { defineState } from "@morph-data/componnents";
export const dateRangeStart = defineState(undefined);
export const dateRangeEnd = defineState(undefined);
```
The argument is actually executed with the following command in Morph's CLI.
If executed in the Code tab, this argument is not added, so you need to specify the default value.
You can specify variables with `-d` as follows.
```bash Shell theme={"dark"}
morph run get_users -d user_type=admin
```
## Use Variables in SQL/Python
Variables are passed to SQL as arguments enclosed in `{{ }}` in Jinja format.
```sql theme={"dark"}
{{
config(
name="get_users",
)
}}
{% if user_type %}
select * from user where user_type = '{{ user_type }}'
{% else %}
select * from user
{% endif %}
```
Variables are passed to Python as `context.vars[key] = value`.
```python theme={"dark"}
@morph.func
def get_data_from_database(context):
var1_data = context.vars["var1"]
# write your code here using var1_data
return pd.DataFrame({})
```
You can set default values and add validation to variables using `@morph.variables`.
```python theme={"dark"}
@morph.func
@morph.variables("var1", default="value", required=True, type="str")
def get_data_from_database(context):
var1_data = context.vars["var1"]
# write your code here using var1_data
return pd.DataFrame({})
```
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