> For the complete documentation index, see [llms.txt](https://docs.chartsql.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chartsql.com/charts/combo.md).
# Combo
## 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