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Database index can improve query efficiency. Ask what will improve, what is the difference between inapplicable index and index use, and what will happen.

2022-06-24 19:32:00 【Jade label】

1) No index , Full table scanning of data , Until the corresponding data is found .
2） After using the index , The physical address corresponding to the data will be found in the index page first , Get the corresponding data directly .

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