freeCodeCamp/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-database-design.md

---
id: 5e7b9f180b6c005b0e76f08c
title: 关系数据库设计
challengeType: 11
videoId: AqdfbrpkbHk
dashedName: relational-database-design
---

# --question--

## --text--

对于一个字符串数据应该被保存在一个数据库里多少次，最佳实践是什么？

## --answers--

0

---

1

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2

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3

## --video-solution--

2
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`
			`id: 5e7b9f180b6c005b0e76f08c`
chore(i18n,curriculum): update translations (#42659) 2021-06-28 20:01:36 +05:30			`title: 关系数据库设计`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`challengeType: 11`
			`videoId: AqdfbrpkbHk`
feat(curriculum): restore seed + solution to Chinese (#40683) * feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com> 2021-01-13 03:31:00 +01:00			`dashedName: relational-database-design`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`

chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00			`# --question--`

			`## --text--`

chore(i18n,curriculum): update translations (#42659) 2021-06-28 20:01:36 +05:30			`对于一个字符串数据应该被保存在一个数据库里多少次，最佳实践是什么？`
chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00
			`## --answers--`

			`0`

			`---`

			`1`

			`---`

			`2`

			`---`

			`3`

			`## --video-solution--`

			`2`