0726~ resume sorting interview summary

What are some ways to create threads ？

1. Inherit Thread class ;

2. Realization Rannable Interface ;

3. Realization callable Interface ;

4. Create from thread pool ;

Which situations should be indexed ?

Fields that need to be searched frequently ;

Association fields in multi table Association ;

Sorted fields ;

Frequently searched fields ;

Under what circumstances do not build an index ?

where Fields not often used in conditions ;

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