## Column Chart with Secondary Line
```sql
-- @chart: combo
-- @title: Combo - Column Chat with Secondary Line
-- @subtitle: A combo chart with a column series and a secondary line series
-- @category: Channel
-- @series: TotalDeals
-- @secondary-series: ConversionRate
-- @series-types: column, line
-- @formats: currency, percent
SELECT
Sub.*,
ROUND(WonDeals / TotalDeals * 100, 1) as ConversionRate
FROM (
SELECT
Channel,
CAST(count(*) AS FLOAT) as TotalDeals,
SUM(CASE WHEN Status = 'Won' THEN 1 ELSE 0 END) as WonDeals
FROM Sales
WHERE Status = 'Won' or Status = 'Lost'
GROUP BY Channel
) as Sub
```
An example combo chart that has a column and a line series
| CHANNEL | TOTALDEALS | WONDEALS | CONVERSIONRATE |
| -------- | ---------- | -------- | -------------- |
| coldcall | 206.0 | 37.0 | 18.0 |
| referral | 1069.0 | 243.0 | 22.7 |
| search | 344.0 | 66.0 | 19.2 |
| event | 427.0 | 112.0 | 26.2 |
| pr\_ad | 110.0 | 21.0 | 19.1 |
---
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