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Percentile approximation ToolkitTimescaleDB Toolkit functions are available under Timescale Community Edition. They are automatically included with Timescale Cloud. Click to learn more.
Toolkit
TimescaleDB Toolkit functions are available under Timescale Community Edition. They are automatically included with Timescale Cloud. Click to learn more.
This section contains functions related to percentile approximation. Approximation algorithms are used to calculate a percentile without requiring all of the data. For more information about percentile approximation functions, see the hyperfunctions documentation.
Some hyperfunctions are included in the default TimescaleDB product. For additional hyperfunctions, you need to install the Timescale Toolkit PostgreSQL extension.
| Hyperfunction subfamily | Hyperfunction type | API call | Toolkit | Experimental |
|---|---|---|---|---|
| Percentile approximation | Aggregate | percentile_agg() | ✅ | |
| Accessor | approx_percentile() | ✅ | ||
approx_percentile_rank() | ✅ | |||
error() | ✅ | |||
max_val() | ✅ | |||
mean() | ✅ | |||
min_val() | ✅ | |||
num_vals() | ✅ | |||
| Rollup | rollup() | ✅ | ||
| Advanced aggregation | Aggregate | tdigest() | ✅ | |
uddsketch() | ✅ |
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