Add SQLite db size example (fixes #13715) (#14295)

source/_integrations/sql.markdown

@@ -17,7 +17,7 @@ This can be used to present statistics about Home Assistant sensors if used with
 
 To configure this sensor, you need to define the sensor connection variables and a list of queries to your `configuration.yaml` file. A sensor will be created for each query:
 
-To enable it, add the following lines to your `configuration.yaml`:
+To enable it, add the following lines to your `configuration.yaml` file:
 
 {% raw %}
 ```yaml
@@ -109,7 +109,7 @@ SELECT * FROM states WHERE entity_id = 'binary_sensor.xyz789' GROUP BY state ORD
 
 ### Database size
 
-#### Database size in Postgres
+#### Postgres
 
 {% raw %}
 ```yaml
@@ -140,3 +140,19 @@ sensor:
         unit_of_measurement: kB
 ```
 {% endraw %}
+
+#### SQLite
+
+If you are using the `recorder` integration then you don't need to specify the location of the database. For all other cases, add `db_url: sqlite:////path/to/database.db`.
+
+{% raw %}
+```yaml
+sensor:
+  - platform: sql
+    queries:
+      - name: DB Size
+        query: 'SELECT ROUND(page_count * page_size / 1024 / 1024, 1) as size FROM pragma_page_count(), pragma_page_size();'
+        column: 'size'
+        unit_of_measurement: 'MiB'
+```
+{% endraw %}