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 ))
}

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

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

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

CREATE TABLE sale(Mont INT, sales INT)

LOAD DATA INFILE "data/moving_avg.csv"
INTO TABLE sale
FIELDS TERMINATED BY ","

select sd(a) + sales from tt, sale where tt.a = sale.Mont