SQL优化

insert优化

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主键优化

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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order by

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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group by

 

 

 

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limit

 

 

 

 

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count

 

 

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update