Aggregate functions (Linear Regression) , Window function syntax and usage
Returns REGR_COUNT(y, x) * VAR_POP(x) for non-null pairs.
Syntax¶Aggregate function
Window function
REGR_SXX(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.
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); SELECT k, REGR_SXX(v, v2) FROM aggr GROUP BY k;
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+---+-----------------+ | k | regr_sxx(v, v2) | |---+-----------------| | 1 | [NULL] | | 2 | 288.666666667 | +---+-----------------+
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