COVAR_POP

Returns the population covariance for non-NULL pairs across all input values.

Syntax

COVAR_POP(expression1 numeric, expression2 numeric) → double

• expression1: An expression that evaluates to a numeric type. This parameter is the dependent value.

• expression2: An expression that evaluates to a numeric type. This parameter is the independent value.

Examples

Aggregate function example

SELECT COVAR_POP(transaction_count, gas_used)
FROM eth.recent_blocks

-- 31.70536771189994

Aggregate function example using optional DISTINCT clause

SELECT COVAR_POP(DISTINCT transaction_count, gas_used)
FROM eth.recent_blocks

-- 302.592806814443e

Window function example

SELECT COVAR_POP(transaction_count, gas_used)
  OVER (PARTITION BY transaction_count)
FROM eth.recent_blocks

-- 1.5543122344752192e-15

Usage Note

This function supports the use of ALL and DISTINCT:

SELECT COVAR_POP( [ { ALL | DISTINCT } ] expression1, expression2)