Which two statements are true about substitution variables? A) A substitution variable used to prompt for a column name must be endorsed in single quotation marks. B) A substitution variable used to p ...

Which statements are true regarding primary and foreign key constraints and the effect they can have on table data? A) A table can have only one primary key but multiple foreign keys. B) It is possibl ...

1、with admin option 用于系统权限授权，with grant option 用于对象授权。 2、给一个用户授予系统权限带上with admin option 时，此用户可把此系统权限授予其他用户或角色，但收回这个用户的系统权限时，这个用户 ...

Examine this business rule: Each student can work on multiple projects and each project can have multiple students. You must design an Entity Relationship(ER) model for optimal data storage and allow ...

Which two are true about the MERGE statement? A) The WHEN NOT MATCHED clause can be used to specify the deletions to be performed. B) The WHEN NOT MATCHED clause can be used to specify the inserts to ...

Examine the description of the EMPLOYEES table: Name Null Type EMP_ID NOT NULL NUMBER EMP_NAME ...

Examine the description of the CUSTONERS table: Name Null? Type CUSTNO NOT NULL NUMBER(3) CUSTNAME NOT NULL ...

全栈数据库成熟的应用可能会用到许许多多的数据组件（功能）：缓存，OLTP，OLAP/批处理/数据仓库，流处理/消息队列，搜索索引，NoSQL/文档数据库，地理数据库，空间数据库，时序数据库，图数据库。传统的架构选型呢 ...