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Create useful-snippets.md with some useful DB queries #74

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Oct 10, 2018
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Create useful-snippets.md with some useful DB queries #74

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33 changes: 33 additions & 0 deletions docs/useful-snippets.md
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# Useful snippets

## Database queries

### Query current states for all labels
```
SELECT history.label_name, history.created, history.new_state
FROM history
JOIN (
SELECT label_name, MAX(created) AS max_created
FROM history
GROUP BY label_name
) latest_states
ON
history.created = latest_states.max_created AND
history.label_name = latest_states.label_name;
```

### Count number of labels in a specific state

```
SELECT COUNT(*)
FROM history
JOIN (
SELECT label_name, MAX(created) AS max_created
FROM history
GROUP BY label_name
) latest_states
ON
history.created = latest_states.max_created AND
history.label_name = latest_states.label_name
WHERE history.new_state = 'STATE_NAME';
```