Ex : I have 1 table below
ID USER1 USER2 USER3
1 X X
2 X X
3 X X
4 X X
5 X X
How i can check ALL value USER2 comlumn is empty in PHP & MySQL? I code below but it's not working
$res = mysqli_query($conn, "SELECT USER2 FROM TABLE")
if(count($res)== "0") echo "OK";