regr_avgy aggregate function
Applies to: Databricks SQL Databricks Runtime 10.5 and above
Returns the mean of
yExpr calculated from values of a group where
yExpr are NOT NULL.
regr_avgy( [ALL | DISTINCT] yExpr, xExpr) [FILTER ( WHERE cond ) ]
This function can also be invoked as a window function using the
yExpr: An numeric expression, the dependent variable.
xExpr: An numeric expression, the independent variable.
cond: An optional boolean expression filtering the rows used for the function.
The result type depends on the type of
DECIMAL(p, s): The result type is a` DECIMAL(p + 4, s + 4)`. If the maximum precision for DECIMAL is reached the increase in scale will be limited to avoid loss of significant digits.
Otherwise the result is a DOUBLE.
Any nulls within the group are ignored. If a group is empty or consists only of nulls, the result is NULL.
DISTINCT is specified the average is computed after duplicates have been removed.
regr_avgy(y, x) is a synonym for
avg(y) FILTER(WHERE x IS NOT NULL AND y IS NOT NULL).