Categories:

Aggregate functions (Linear Regression) , Window function syntax and usage

REGR_SYY

Returns REGR_COUNT(y, x) * VAR_POP(y) for non-null pairs.

Syntax

Aggregate function

REGR_SYY(y, x)
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Window function

REGR_SYY(y, x) ( [ 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.

Returns

If any of the input expressions is of type DECFLOAT, the returned type is DECFLOAT. Otherwise, the returned type is FLOAT.

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.

Examples

CREATE OR REPLACE TABLEE 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_SYY(v, v2) FROM aggr GROUP BY k;
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+---+-----------------+ | k | regr_syy(v, v2) | |---+-----------------| | 1 | [NULL] | | 2 | 200 | +---+-----------------+
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