首页 > 试题广场 >

What’s correct description for

[不定项选择题]
What’s correct description for Primary Key and Unique Key? (单选)
  • PK and UK should be Unique
  • PK and UK should be Not Null values
  • PK and UK should be Null value
  • PK should be Not Null values and UK can be Null values

这道题你会答吗?花几分钟告诉大家答案吧!