mysql: add average-population-of-each-continent

diff --git a/java8/simple-array-sum b/java8/simple-array-sum
lub c2ce85ad4c mysql: add average-population-of-each-continent		1年前
java8/simple-array-sum	simple-array-sum solution	1年前
mysql	mysql: add average-population-of-each-continent	1年前
python3	python3: add a-very-big-sum	1年前