Master key, secondary key and primary key are all can be used to encrypt file or communication.
举一反三
- The primary key cannot be used as a foreign key in another relation.( )
- If students can not understand and master key points, teachers should give up key points.
- 为已经存在的表添加主键约束用到的关键字是()[br][/br](2.0) A: drop primary key B: add primary key C: create primary key D: show primary key
- 在CREATE TABLE语句中，使用（ ） 关键字来指定主键。 A: PRIMARY B: MAIN KEY C: PRIMARY KEY D: FOREIGN KEY
- What types of lighting are used in the following images: LOW KEY and HIGH KEY? 5.55 Low Key or High Key Lighting?