Change Ubuntu 18.04 update source to mirror site in China

## In China, Ubuntu might be slow to updateTo use ubuntu is not a easy thing, and if you are in China, it's even more difficult. Once you

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Disable Web Search Result in Windows Search 2019

**TL;DR**: download this [windows reg file]( and double click to import it. OR- co

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MySQL: Sort Number in String Format

TL;DR: use `key_name` `*` `1`; like``` select id, name, age from users order by salary * 1 ```Well, it's better to store number data i

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