FUNCTION covariance (x , y ) {
xmean := avg (x) ;
ymean := avg (y) ;
avg (( x - xmean ) * (y - ymean ))
}


FUNCTION sd ( x) {
sqrt ( covariance (x , x) )
}

FUNCTION pairCorr (x , y ) {
covariance (x , y ) / ( sd (x) * sd (y ))
}

CREATE TABLE test1(a INT, b INT, c INT, d INT)

LOAD DATA INFILE "data/test.csv"
INTO TABLE test1
FIELDS TERMINATED BY ","

SELECT pairCorr(c, b) * d, a, sum(b)
FROM test1
group by a
order by b ASC