Categories:

Aggregate Functions (Linear Regression) , Window Functions

REGR_SXX¶

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

Syntax¶

Aggregate function

REGR_SXX(y, x)
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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 used as a window function:

    • This function does not support:

      • ORDER BY sub-clause in the OVER() clause.

      • Window frames.

Examples¶

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_sxx(v, v2) from aggr group by k;

---+-----------------+
 k | regr_sxx(v, v2) |
---+-----------------+
 1 | [NULL]          |
 2 | 288.666666667   |
---+-----------------+
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