所谓房地产的合法权益是指房地产的（）。 产权合法。 使用合法。 处分合法。 收益合法。
The RVPC user can do which of the following？（） Register databases if granted the register database privilege。 See all databases in the recovery-catalog schema。 See all database-related metadata in the recovery catalog if they are granted access to that database。 Unregister databases from the RVPC catalog that were not granted to the RVPC catalog owner with the grant command。 Not be connected to with the RMAN command-line catalog parameter for backup or recovery purpose。
心理眩光
To make audit information more productive， the DBA executes the following command before starting an auditoperation： SQL> ALTER SYSTEM SET AUDIT_TRAIL=DB，EXTENDED SCOPE=SPFILE； Which statement is true regarding the audit record generated when auditing starts after restarting Thedatabase（） It contains only the plan for the SQL statement executed by the user.。 It contains the SQL text executed by the user and the bind variables used with it.。 It contains the plan and statistics associated with the SQL statement executed by the user.。 It contains the plan for the SQL statement executed by the user and the bind variables used with it。
《工程建设强制性条文》（电力工程部分）规定，地下开挖工程施工，进行爆破时，人员应撤至飞石、有害气体和冲击波影响范围之外，且无落石威胁的安全地点。单向开挖隧洞，安全地点至爆破工作面的距离，应不少于（）m。 50。 100。 200。 500。
Which constraint can be defines only at the column level? （）
