Meaning of ">" in MySQL update statement -

first things first. know ms sql server. so, hard understand mysql syntax. below statement in mysql:

insert stats_by_variantstats(variant_id, count, nonzero, sum, avg, sumsq, wavg) values(5, 1, 0, 0, 0, 0, 0) on duplicate key update         count = count + $count,         nonzero = nonzero + ($value>0),         sum = sum + $value,         avg = sum / (count + 1),         sumsq = sumsq + ($value * $value),         wavg = 0.9 * wavg + 0.1 * $value 

what meaning of ($value>0) in above statement (line: 5) following cases:

1. $value = 0
2. $value = 1
3. $value = 10

thanks in anticipation.

this boolean expression. meaning identical conditional expression:

case when $value>0 1 else 0 end 

in case of update, nonzero column incremented each time $value positive.