Line

Track how a measure changes over time or across an ordered dimension.

Line charts connect data points with a continuous line. Use them when the direction and rate of change matter — trends over time, trajectories of multiple series, or any ordered dimension where continuity is meaningful.

Variants

Single series

One measure plotted against a time or ordered dimension. The simplest and most common use case.

Multi-series

Multiple lines plotted on the same axes. Map a second dimension to the Color channel to split one measure into one line per dimension value, or add multiple measures to the Y axis to plot them as separate series.

With reference line

A horizontal reference line marks a target, threshold, or benchmark. Added via the Axes section of the Style tab.

Reference lines

Add a horizontal reference line in the Y axis section of the Style tab. Set the value, label, color, and line style (solid, dashed, or dotted). Multiple reference lines are supported.

See Axes for the full configuration reference.

Axis behavior

Line charts use a temporal X axis for time dimensions — continuous, time-aware, and not constrained to the result set. For non-time dimensions, the axis is ordinal and follows the result set sort order. Gaps in the line indicate missing data points.

Combining with bars

To layer a line on top of a bar chart, add a second series to the Y axis, set its mark type to Line in series configuration, and assign it to the right Y axis for a dual-axis layout.