The intercept of the least squares fit line computed from the adjusted counter values and times input in the CounterSummary. This corresponds to the projected value at the PostgreSQL epoch (2000-01-01 00:00:00+00). This is useful for drawing the best fit line on a graph, using the slope and the intercept.

intercept(
summary CounterSummary
) RETURNS DOUBLE PRECISION

For more information about counter aggregation functions, see the hyperfunctions documentation.

NameTypeDescription
summaryCounterSummaryThe input CounterSummary from a counter_agg call
NameTypeDescription
interceptDOUBLE PRECISIONThe intercept of the least squares fit line computed from the points input to the CounterSummary
SELECT
id,
bucket,
intercept(summary)
FROM (
SELECT
id,
time_bucket('15 min'::interval, ts) AS bucket,
counter_agg(ts, val) AS summary
FROM foo
GROUP BY id, time_bucket('15 min'::interval, ts)
) t

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