people also ask：
baike
mobile
I ASK
QuesHub APP
QuesHub > 主键 > 表记 > 组合 > ASK DETAIL

What is the primary key in a database?

Harper Foster | 2023-05-05 13:41:57 | page views：1896
I'll answer
Earn 20 gold coins for an accepted answer.20 Earn 20 gold coins for an accepted answer.
40more
Best Answer | Search More answer on queshub>>

Benjamin Baker

Works at the International Energy Agency, Lives in Paris, France.
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
2023-05-12 13:41:57
评论(499) Helpful(122)

Zoe Lee

QuesHub.com delivers expert answers and knowledge to you.
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records. A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
What is a Primary Key? - Definition from Techopedia
ORG URL>>
首页 上一页 1 NEXT  LAST
  • 0
    0
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    3

people are using QuesHub for answers.

Me Too.
RunTime:0.9861|| InterfaceTime : 0

Add your answer:

RunTime:0.8306 || DBTime : 0

HOT TOPIC

ask:3,asku:1,askr:137,askz:21,askd:152,RedisW:0askR:3,askD：0 mz:hit,askU:0,askT:0askA:4