8. Indexes How TO
SELECT * FROM `battles` WHERE `battle_id` = 32175
SELECT * FROM `battles` WHERE `citizen_id` = 342311
id battle_id round citizen_id …
9. Indexes How TO
SELECT * FROM `battles` WHERE `battle_id` = 32175 AND `round` = 2
id battle_id round citizen_id …
SELECT * FROM `battles` WHERE `battle_id` = 32175
SELECT * FROM `battles` WHERE `round` = 2✕