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mysql查询优化，谁能帮我优化查询啊？我这个太慢了，慢死了

mysql优化sql
select mobileuserid,caozuoleixing,caozuozhi,xiguanzhi from 表a where xiguanzhi>2
group by mobileuserid,caozuoleixing,caozuozhi,xiguanzhi
order by mobileuserid,caozuoleixing,xiguanzhi desc limit 3000
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