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Add SQL example to get former value (#19105)

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Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>
Co-authored-by: Franck Nijhof <frenck@frenck.nl>
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jugla 2021-10-26 13:34:06 +02:00 committed by GitHub
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source/_integrations/sql.markdown
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@ -106,10 +106,19 @@ Note that the SQL sensor state corresponds to the last row of the SQL result set
### Previous state of an entity
This example only works with *binary_sensors*:
Based on previous example with temperature, the query to get the former state is :
```sql
SELECT * FROM states WHERE entity_id = 'binary_sensor.xyz789' GROUP BY state ORDER BY last_changed DESC LIMIT 1;
SELECT * FROM (SELECT * FROM states WHERE entity_id = 'sensor.temperature_in' ORDER BY state_id DESC LIMIT 2) two_entity ORDER BY state_id ASC LIMIT 1;
```
Thus in yaml
```yaml
# Example configuration.yaml
sensor:
- platform: sql
queries:
- name: Former_Temperature_In
query: "SELECT * FROM (SELECT state FROM states WHERE entity_id = 'sensor.temperature_in' ORDER BY state_id DESC LIMIT 2) two_entity ORDER BY state_id ASC LIMIT 1;"
column: "state"
```
### Database size