Aggregate functions (Linear Regression) , Window functions
Returns the average of the independent variable for non-null pairs in a group, where x is the independent variable and y is the dependent variable.
Aggregate function
Window function
REGR_AVGX(y, x) OVER ( [ PARTITION BY <expr3> ] )
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Arguments¶y
The dependent variable. This must be an expression that can be evaluated to a numeric type.
x
The independent variable. This must be an expression that can be evaluated to a numeric type.
expr3
This is the optional expression used to group rows into partitions.
Important
Note the order of the arguments; the dependent variable is first.
Usage notes¶DISTINCT is not supported for this function.
In order for a row to be included in the average, BOTH the x and y values must be non-NULL.
When this function is called as a window function, it does not support:
An ORDER BY clause within the OVER clause.
Explicit window frames.
CREATE OR REPLACE TABLE aggr(k int, v decimal(10,2), v2 decimal(10, 2)); INSERT INTO aggr VALUES(1, 10, NULL); INSERT INTO aggr VALUES(2, 10, 11), (2, 20, 22), (2, 25, NULL), (2, 30, 35);
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SELECT k, REGR_AVGX(v, v2) FROM aggr GROUP BY k; ---+------------------+ k | regr_avgx(v, v2) | ---+------------------+ 1 | [NULL] | 2 | 22.666666667 | ---+------------------+
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