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- [Programmers] String, Date 2021.10.30
- 12 Rules for Life - Jordan B. Peterson: Rule 3 (Make Friends with People Who Want the Best For You) 2021.10.29
- [Programmers] JOIN 2021.10.28
- [Programmers] IS NULL 2021.10.28
- [Programmers] GROUP BY 2021.10.27