sql优化：select * from `table1` t1 LEFT t2.id=t1.id order by t2.order 速度很慢
sql优化：select * from `table1` t1 LEFT t2.id=t1.i
阅读背景：
sql优化：select * from `table1` t1 LEFT t2.id=t1.id order by t2.order 速度很慢
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