A subquery should retrieve only one row.
A subquery can retrieve zero or more rows.
A subquery can be used only in SQL query statements.
Subqueries CANNOT be nested by more than two levels.
A subquery CANNOT be used in an SQL query statement that uses group functions.
When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.
第1题:
对
错
第2题:
近关系调
等调
平行大小调
同主音大小调
第3题:
第4题:
多样化
便携化
移动化
单一化
普通化
第5题:
对
错
第6题:
Speakers are in regulatory compliance.
Speakers are on and the mute is off.
Speakers are on the Windows HCL.
The system has enough hard drive space.
The audio driver is installed correctly.
Speakers are plugged into the correct jack.
第7题:
对
错
第8题:
污染地质纪系
有害地质纪系
废物地质纪系
人为地质纪系
第9题:
蓝
绿
黄
黑
第10题:
设计者
试验者
领航者