I am trying to optimize this query below to make it more efficient and stop loading slow. Can someone please show me what I would need to be doing to optimize this for future references.
SELECT * , username AS user,
(SELECT COUNT(*) FROM pvp WHERE killer = user) AS kills,
(SELECT COUNT(*) FROM pvp WHERE username = user) AS deaths,
ROUND(kills / deaths, 2) AS kd FROM stats WHERE username = "Username"