单选题What is true about joining tables through an equijoin? （）A You can join a maximum of two tables through an equijoin.B You can join a maximum of two columns through an equijoin.C You specify an equijoin condition in the SELECT or FROM clauses of a SELEC

题目
单选题
What is true about joining tables through an equijoin? （）
A

You can join a maximum of two tables through an equijoin.

B

You can join a maximum of two columns through an equijoin.

C

You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.

D

To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

E

You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.

相似考题

1.() is very attractive because it is about how people make sense of each other through analyzing what they say.A、SemanticsB、SyntacticsC、PragmaticsD、semiotics

2.What is true about joining tables through an equijoin? ()A. You can join a maximum of two tables through an equijoin.B. You can join a maximum of two columns through an equijoin.C. You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.D. To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.E. You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.

3.You use the segment advisor to help determine objects for which space may be reclaimed.Which three statements are true about the advisor given by the segment advisor?()A. It may advise the use of online table redefinition for tables in dictionary managed tablespace.B. It may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows.C. It may advise the use of online table redefinition for tables in locally managed tablespacesD. It will detect and advise about chained rows.E. It may advise the use of segment shrink for free list managed tables.

4.What is true about updates through a view? ()A. You cannot update a view with group functions.B. When you update a view group functions are automatically computed.C. When you update a view only the constraints on the underlying table will be in effect.D. When you update a view the constraints on the views always override the constraints on the underlying tables.

更多“What is true about joining tables through an equijoin? （）”相关问题

  • 第1题：

    Which three are true about the large pool for an Oracle database instance that supports shared serverconnections?()

    A. Allocates memory for RMAN backup and restore operations

    B. Allocates memory for shared and private SQL areas

    C. Contains a cursor area for storing runtime information about cursors

    D. Contains stack space

    E. Contains a hash area performing hash joins of tables


    参考答案：A, B, C

  • 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：

    What is true about the WITH GRANT OPTION clause?（）

    • A、It allows a grantee DBA privileges.
    • B、It is required syntax for object privileges.
    • C、It allows privileges on specified columns of tables.
    • D、It is used to grant an object privilege on a foreign key column.
    • E、It allows the grantee to grant object privileges to other users and roles.

    正确答案:E

  • 第4题：

    Which two statements are true about the Automatic Workload Repository （AWR）（）

    • A、All AWR tables belong to the SYSTEM schema.
    • B、The AWR contains systemwide tracing and logging information.
    • C、The snapshots collected by the AWR are accessible through data dictionary views.
    • D、The snapshots collected by the AWR are used by self-tuning components in the database.

    正确答案:C,D

  • 第5题：

    You executed the following command to create a tablespace called SALES_DATA： SQL> CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO； Which two statements are true about the SALES_DATA tablespace（）

    • A、The database automatically determines the extent-sizing policy for the tablespace.
    • B、The segments are automatically shrunk when the contents are removed from them.
    • C、The allocation of extents within the tablespace is managed through the dictionary tables.
    • D、The space utilization description of the data blocks in segments is recorded in bitmap blocks.
    • E、The space utilization description of the data blocks in segments is managed through free lists.

    正确答案:A,D

  • 第6题：

    多选题
    Which two are true regarding external tables？ （）
    A

    External tables can be updated.

    B

    External tables are read-only tables.

    C

    Indexes can be created on external tables.

    D

    Indexes cannot be created on external tables.


    正确答案： D,B
    解析： 暂无解析

  • 第7题：

    多选题
    You use the segment advisor to help determine objects for which space may be reclaimed. Which three statements are true about the advisor given by the segment advisor?（）
    A

    It may advise the use of online table redefinition for tables in dictionary managed tablespace.

    B

    It may advise the use of segment shrink for tables in dictionary managed tablespaces it the no chained rows.

    C

    It may advise the use of online table redefinition for tables in locally managed tablespaces

    D

    It will detect and advise about chained rows.

    E

    It may advise the use of segment shrink for free list managed tables.


    正确答案： D,C
    解析： 暂无解析

  • 第8题：

    单选题
    _____ you told me _____ true?
    A

    Is what; /

    B

    What; /

    C

    That; is

    D

    What about; is


    正确答案： D
    解析：
    句意为“你所告诉我的是真的吗？”。主句中缺主语，从句中缺宾语，what名词性从句在句子中充当主语。

  • 第9题：

    单选题
    Which statement is true about the forwarding plane?（）
    A

    It uses ASICs for increased performance.

    B

    It is the intelligence of the platform.

    C

    It maintains the routing tables.

    D

    It is based on an x86 architecture.


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    What is true about updates through a view? （）
    A

    You cannot update a view with group functions.

    B

    When you update a view group functions are automatically computed.

    C

    When you update a view only the constraints on the underlying table will be in effect.

    D

    When you update a view the constraints on the views always override the constraints on the underlying tables.


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    What is true about this statement used during import？（） imp hr/hr tables= （employee， departments） file=hr.dmp ignore=y
    A

    It ignores duplicates.

    B

    It prevents character set translation on import.

    C

    It allows rows to be inserted into a table that already exists.

    D

    It ignores storage parameters in the DML executed during import.


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    What is true about version-enabled tables？（）
    A

    The unit of versioning is the schema.

    B

    It is possible to version enable a table pertaining to SYS.

    C

    There are as many segments as versions for the same base table.

    D

    It is possible to create workspaces if there is no version-enabled table in the database.


    正确答案： D
    解析： 暂无解析

  • 第13题：

    Which statement about Belgium is NOT true?

    A.it is twice as big as Beijing.
    B.it has two major ethnic groups.
    C.it has gone through quite a few threats of division.
    D.it has no government.

    答案：D
    解析：

  • 第14题：

    Which statement is true about the forwarding plane?（）

    • A、The forwarding plane is the intelligence of the plattform
    • B、The forwarding plane is based on an x86 architecture
    • C、The forwarding plane maintains the routing tables, brdiging table, and primary forwarding table
    • D、The forwarding plane implements policers, stateless firwall filters, and class of service

    正确答案:D

  • 第15题：

    Which statement is true about the forwarding plane?（）

    • A、It uses ASICs for increased performance.
    • B、It is the intelligence of the platform.
    • C、It maintains the routing tables.
    • D、It is based on an x86 architecture.

    正确答案:A

  • 第16题：

    Which three are true about the large pool for an Oracle database instance that supports shared serverconnections?（）

    • A、Allocates memory for RMAN backup and restore operations
    • B、Allocates memory for shared and private SQL areas
    • C、Contains a cursor area for storing runtime information about cursors
    • D、Contains stack space
    • E、Contains a hash area performing hash joins of tables

    正确答案:A,B,C

  • 第17题：

    What is true about version-enabled tables？（）

    • A、The unit of versioning is the schema.
    • B、It is possible to version enable a table pertaining to SYS.
    • C、There are as many segments as versions for the same base table.
    • D、It is possible to create workspaces if there is no version-enabled table in the database.

    正确答案:D

  • 第18题：

    单选题
    What is true about the WITH GRANT OPTION clause?（）
    A

    It allows a grantee DBA privileges.

    B

    It is required syntax for object privileges.

    C

    It allows privileges on specified columns of tables.

    D

    It is used to grant an object privilege on a foreign key column.

    E

    It allows the grantee to grant object privileges to other users and roles.


    正确答案： D
    解析： 暂无解析

  • 第19题：

    多选题
    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,A
    解析： 暂无解析

  • 第20题：

    单选题
    What is true about joining tables through an equijoin?（）
    A

    You can join a maximum of two tables through an equijoin.

    B

    You can join a maximum of two columns through an equijoin.

    C

    You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.

    D

    To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

    E

    You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.


    正确答案： B
    解析： 暂无解析

  • 第21题：

    多选题
    You executed the following command to create a tablespace called SALES_DATA：  > CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO；  Which two statements are true about the SALES_DATA tablespace （）
    A

    The database automatically determines the extent-sizing policy for the tablespace.

    B

    The segments are automatically shrunk when the contents are removed from them.

    C

    The allocation of extents within the tablespace is managed through the dictionary tables.

    D

    The space utilization description of the data blocks in segments is recorded inbitmapblocks.

    E

    The space utilization description of the data blocks in segments is managed through free lists.MANUAL


    正确答案： E,C
    解析： 暂无解析

  • 第22题：

    单选题
    What is mentioned about Hanguk Palace?
    A

    Its exterior is stylishly decorated.

    B

    All of its tables are equipped with grills.

    C

    It is family-owned and operated.

    D

    Most of its patrons are Korean.


    正确答案： A
    解析：
    根据第二段第二句“That’s when I was greeted warmly by Dae-Ho Lee, the youngest son of the family who immigrated to Smithdale last year and opened the restaurant”可知，这家韩国餐馆是一家人开的。所以C项正确。

  • 第23题：

    多选题
    Which two statements are true about the Automatic Workload Repository （AWR）（）
    A

    All AWR tables belong to the SYSTEM schema.

    B

    The AWR contains systemwide tracing and logging information.

    C

    The snapshots collected by the AWR are accessible through data dictionary views.

    D

    The snapshots collected by the AWR are used by self-tuning components in the database.


    正确答案： C,B
    解析： AWR 基础结构由两个主要部分组成：  • 一个内存中统计信息收集工具，Oracle Database 11g组件使用它来收集统计信息。出于性能方面的考虑，这些统计信息存储在内存中。可以通过动态性能(V$) 视图访问存储在内存中的统计信息。  • 代表该工具持久部分的AWR 快照。AWR 快照可以通过数据字典视图和EnterpriseManager Database Control 来访问。  它为内部Oracle 服务器组件提供服务来收集、处理、维护和使用性能统计信息，以便进行问题检测和自优化。 AWR 中包含数百个表，所有这些表均属于SYSMAN方案且存储在SYSAUX表空间中。

  • 第24题：

    多选题
    Which three are true about the large pool for an Oracle database instance that supports shared serverconnections?（）
    A

    Allocates memory for RMAN backup and restore operations

    B

    Allocates memory for shared and private SQL areas

    C

    Contains a cursor area for storing runtime information about cursors

    D

    Contains stack space

    E

    Contains a hash area performing hash joins of tables


    正确答案： E,C
    解析： 暂无解析

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