题目内容

In a desert environment, even the small amount of water that could be held could allow for a day or two. (survive)

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Many people are now having trouble making their house payments. (month)

以下属于关系型数据库的有哪些？

A. MySQL
B. Oracle
C. SQL Server
D. Redis

以下属于非关系型数据库的有哪些？

A. Redis
B. MongoDB
C. HBase
D. Neo4J

主键只能设置一列为每一行的唯一标识。

A. 对
B. 错