Categories:

Aggregate Functions (Linear Regression) , Window Functions

REGR_SXY

Returns REGR_COUNT(expr1, expr2) * COVAR_POP(expr1, expr2) for non-null pairs.

Syntax

Aggregate function

REGR_SXY(y, x)

Window function

REGR_SXY(y, x) OVER ( [ PARTITION BY <expr3> ] )

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);
select k, regr_sxy(v, v2) from aggr group by k;

---+-----------------+
 k | regr_sxy(v, v2) |
---+-----------------+
 1 | [NULL]          |
 2 | 240             |
---+-----------------+