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Which three statements are true regarding subqueries?（）

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Which three statements are true regarding subqueries?（）
A

Subqueries can contain GROUP BY and ORDER BY clauses

B

Main query and subquery can get data from different tables

C

Main query and subquery must get data from the same tables

D

Subqueries can contain ORDER BY but not the GROUP BY clause

E

Only one column or expression can be compared between the main query and subquery

F

Multiple columns or expressions can be compared between the main query and subquery

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相似问题和答案

第1题：

Which three statements are true regarding the use of the Database Migration Assistant for Unicode(DMU)?()

A. A DBA can check specific tables with the DMU

B. The database to be migrated must be opened read-only.

C. The release of the database to be converted can be any release since 9.2.0.8.

D. The DMU can report columns that are too long in the converted characterset.

E. The DMU can report columns that are not represented in the converted characterset.


参考答案：A, D, E

第2题：

Which two statements are true regarding the USING clause in table joins?（）

  • A、It can be used to join a maximum of three tables 
  • B、It can be used to restrict the number of columns used in a NATURAL join 
  • C、It can be used to access data from tables through equijoins as well as nonequijoins 
  • D、It can be used to join tables that have columns with the same name and compatible data types

正确答案:B,D

第3题：

Which of the statements regarding benefit-cost analysis in the Special window are true?

A . 1 and 2

B . 2 and 3

C . 1 and 3

D . 1, 2 and 3

E . None of the above.


正确答案：C

第4题：

Which three statements about subqueries are true?（）

  • A、A single row subquery can retrieve only one column and one row.
  • B、A single row subquery can retrieve only one row but many columns.
  • C、A multiple row subquery can retrieve multiple rows and multiple columns.
  • D、A multiple row subquery can be compared by using the “>” operator.
  • E、A single row subquery can use the IN operator.
  • F、A multiple row subquery can use the “=” operator.

正确答案:B,C,E

第5题：

Which statement is true regarding the INTERSECT operator?（）

  • A、It ignores NULL values 
  • B、Reversing the order of the intersected tables alters the result 
  • C、The names of columns in all SELECT statements must be identical 
  • D、The number of columns and data types must be identical for all SELECT statements in the query 

正确答案:D

第6题：

Which two statements are true regarding L2TP? ()(Choose two.)

A. Tunnels are initiated by the LAC

B. Tunnels are initiated by the LNS

C. By default, subscriber authentication occurs on the LNS

D. By default, subscriber authentication occurs on the LAC


参考答案：A, C

第7题：

Which of the following statements is true regarding the VERSIONS BETWEEN clause？（）  

  • A、 The VERSIONS BETWEEN clause may be used in DML statements.
  • B、 The VERSIONS BETWEEN clause may be used in DDL statements.
  • C、 The VERSIONS BETWEEN clause may not be used to query past DDL changes to tables.
  • D、 The VERSIONS BETWEEN clause may not be used to query past DML statements to tables.

正确答案:C

第8题：

134 Which of the statements regarding benefit-cost analysis in the Special window are true?

A. 1 and 2

B. 2 and 3

C. 1 and 3

D. 1, 2 and 3

E. None of the above


正确答案：C

第9题：

Which three statements are true regarding subqueries?（）

  • A、Subqueries can contain GROUP BY and ORDER BY clauses 
  • B、Main query and subquery can get data from different tables 
  • C、Main query and subquery must get data from the same tables 
  • D、Subqueries can contain ORDER BY but not the GROUP BY clause 
  • E、Only one column or expression can be compared between the main query and subquery
  • F、 Multiple columns or expressions can be compared between the main query and subquery

正确答案:A,B,E

第10题：

Which two statements are true regarding L2TP? （）(Choose two.)

  • A、Tunnels are initiated by the LAC
  • B、Tunnels are initiated by the LNS
  • C、By default, subscriber authentication occurs on the LNS
  • D、By default, subscriber authentication occurs on the LAC

正确答案:A,C

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