2020-08-13 12:00:20 +02:00
|
|
|
---
|
|
|
|
|
id: 5e7b9f180b6c005b0e76f08d
|
2021-06-28 20:01:36 +05:30
|
|
|
title: 在关系型数据库中表示关系
|
2020-08-13 12:00:20 +02:00
|
|
|
challengeType: 11
|
2020-12-16 00:37:30 -07:00
|
|
|
videoId: '-orenCNdC2Q'
|
2021-10-03 12:24:27 -07:00
|
|
|
bilibiliIds:
|
|
|
|
|
aid: 931953070
|
|
|
|
|
bvid: BV1FM4y1N7hc
|
|
|
|
|
cid: 377532529
|
2021-01-13 03:31:00 +01:00
|
|
|
dashedName: representing-relationships-in-a-relational-database
|
2020-08-13 12:00:20 +02:00
|
|
|
---
|
|
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
# --question--
|
2020-08-13 12:00:20 +02:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
## --text--
|
2020-08-13 12:00:20 +02:00
|
|
|
|
2021-06-28 20:01:36 +05:30
|
|
|
什么是外键？
|
2020-08-13 12:00:20 +02:00
|
|
|
|
2020-12-16 00:37:30 -07:00
|
|
|
## --answers--
|
2020-08-13 12:00:20 +02:00
|
|
|
|
2021-06-28 20:01:36 +05:30
|
|
|
一个不应存在于这里的键
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
---
|
|
|
|
|
|
2021-06-28 20:01:36 +05:30
|
|
|
一个使用非拉丁字符的键
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
---
|
|
|
|
|
|
2021-06-28 20:01:36 +05:30
|
|
|
一个指向不同表中关联行的主键的数字
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
---
|
|
|
|
|
|
2021-06-28 20:01:36 +05:30
|
|
|
一个在“现实世界”中可能用于查找行的键
|
2020-12-16 00:37:30 -07:00
|
|
|
|
|
|
|
|
## --video-solution--
|
|
|
|
|
|
|
|
|
|
3
|
|
|
|
|
|
