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 st

题目

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.
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2.Evaluate the set of SQL statements:What is true about the set?()A. The DESCRIBE DEPT statement displays the structure of the DEPT table.B. The ROLLBACK statement frees the storage space occupies by the DEPT table.C. The DESCRIBE DEPT statement returns an error ORA-04043: object DEPT does not exist.D. The DESCRIBE DEPT statement displays the structure of the DEPT table only if there is a COMMIT statement introduced before the ROLLBACK statement.

3.What is true about the operation of the Infranet Enforcer? ()A. It assigns users a set of roles.B. It allows access based on auth table entries.C. It verifies whether an endpoint meets security requirements.D. It configures the UAC agent to allow or deny access to resources.

4.The EMPLOYEES table has these columns:Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:What is true about your ALTER statement?()A. Column definitions cannot be altered to add DEFAULT values.B. A change to the DEFAULT value affects only subsequent insertions to the table.C. Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.D. All the rows that have a NULL value for the SALARY column will be updated with the value 5000.

更多“What is true about joining table”相关问题

  • 第1题：

    Which statement is true about a forwarding table?()

    A.It stores a subset of information from the routing table.

    B.It contains routes learned from all protocols to a destination.

    C.It provides a database for routes selected and placed into the routing table.

    D.Every routing protocol maintains its own forwarding table.


    参考答案：A

  • 第2题：

    Which statement is true about a forwarding table?（）

    • A、It stores a subset of information from the routing table.
    • B、It contains routes learned from all protocols to a destination.
    • C、It provides a database for routes selected and placed into the routing table.
    • D、Every routing protocol maintains its own forwarding table.

    正确答案:A

  • 第3题：

    Which statement is true about the routing table?（）

    • A、The routing table exists in the control plane only
    • B、The routing table exists in the control plane and the forwarding plane
    • C、The routing table contains both active and inactive routes
    • D、The routing table is stored on compact flash

    正确答案:A

  • 第4题：

    Which statement is true about the forwarding table?（）

    • A、The forwarding table is stored in the control plane only
    • B、The forwarding table is stored in the control plane and in the forewarding plane
    • C、The forwarding table contains both active and inactive routes
    • D、The forwarding table can contain only sigle next hop per destination

    正确答案:B

  • 第5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6题：

    Which two statements about creating constraints are true?（）

    • A、Constraint names must start with SYS_C
    • B、All constraints must be defines at the column level
    • C、Constraints can be created after the table is created
    • D、Constraints can be created at the same time the table is created
    • E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view

    正确答案:C,D

  • 第7题：

    单选题
    What is true about the operation of the Infranet Enforcer? （）
    A

    It assigns users a set of roles.

    B

    It allows access based on auth table entries.

    C

    It verifies whether an endpoint meets security requirements.

    D

    It configures the UAC agent to allow or deny access to resources.


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    Which statement is true about the routing table?（）
    A

    The routing table exists in the control plane only

    B

    The routing table exists in the control plane and the forwarding plane

    C

    The routing table contains both active and inactive routes

    D

    The routing table is stored on compact flash


    正确答案： D
    解析： 暂无解析

  • 第9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10题：

    单选题
    What is true about sequences? （）
    A

    Once created, a sequence belongs to a specific schema.

    B

    Once created, a sequence is linked to a specific table.

    C

    Once created, a sequence is automatically available to all users.

    D

    Only the DBA can control which sequence is used by a certain table.

    E

    Once created, a sequence is automatically used in all INSERT and UPDATE statements.


    正确答案： D
    解析： 暂无解析

  • 第11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12题：

    多选题
    Which two statements are true about the forwarding table?（）
    A

    The forwarding table lists each source protocol and preference for each destination

    B

    The forwarding table constains only active routes

    C

    The forwarding table is used to process transit packets

    D

    The forwarding table is stored in compact flash


    正确答案： B,C
    解析： 暂无解析

  • 第13题：

    What is true about the operation of the Infranet Enforcer? （）

    • A、It assigns users a set of roles.
    • B、It allows access based on auth table entries.
    • C、It verifies whether an endpoint meets security requirements.
    • D、It configures the UAC agent to allow or deny access to resources.

    正确答案:B

  • 第14题：

    Which statement is true about the routing table?（）

    • A、The routing table exists in the control plane only.
    • B、The routing table exists in the control plane and in the forwarding plane.
    • C、The routing table contains both active and inactive routes.
    • D、The routing table is stored on compact flash.

    正确答案:A

  • 第15题：

    Which two statements are true about the forwarding table?（）

    • A、The forwarding table lists each source protocol and preference for each destination
    • B、The forwarding table constains only active routes
    • C、The forwarding table is used to process transit packets
    • D、The forwarding table is stored in compact flash

    正确答案:B,C

  • 第16题：

    Which two statements are true about the forwarding table?（）

    • A、The forwarding table lists each source protocol and preference for each destination.
    • B、The forwarding table contains only active routes.
    • C、The forwarding table is used to process transit packets.
    • D、The forwarding table is stored in compact flash

    正确答案:B,C

  • 第17题：

    What is true about sequences?（）

    • A、Once created, a sequence belongs to a specific schema.
    • B、Once created, a sequence is linked to a specific table.
    • C、Once created, a sequence is automatically available to all users.
    • D、Only the DBA can control which sequence is used by a certain table.
    • E、Once created, a sequence is automatically used in all INSERT and UPDATE statements.

    正确答案:A

  • 第18题：

    单选题
    Which statement is true about a forwarding table?（）
    A

    It stores a subset of information from the routing table.

    B

    It contains routes learned from all protocols to a destination.

    C

    It provides a database for routes selected and placed into the routing table.

    D

    Every routing protocol maintains its own forwarding table.


    正确答案： B
    解析： 暂无解析

  • 第19题：

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

    The forwarding table is stored in the control plane only

    B

    The forwarding table is stored in the control plane and in the forewarding plane

    C

    The forwarding table contains both active and inactive routes

    D

    The forwarding table can contain only sigle next hop per destination


    正确答案： B
    解析： 暂无解析

  • 第20题：

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

    The forwarding table is stored in the control plane only.

    B

    The forwarding table is stored in the control plane and in the forwarding plane.

    C

    The forwarding table contains both active and inactive routes.

    D

    The forwarding table can contain only a single next hop per destination.


    正确答案： C
    解析： 暂无解析

  • 第21题：

    多选题
    Which two statements about creating constraints are true?（）
    A

    Constraint names must start with SYS_C

    B

    All constraints must be defines at the column level

    C

    Constraints can be created after the table is created

    D

    Constraints can be created at the same time the table is created

    E

    Information about constraints is found in the VIEW_CONSTRAINTS dictionary view


    正确答案： E,D
    解析： 暂无解析

  • 第22题：

    多选题
    Which two statements are true about the forwarding table?（）
    A

    The forwarding table lists each source protocol and preference for each destination.

    B

    The forwarding table contains only active routes.

    C

    The forwarding table is used to process transit packets.

    D

    The forwarding table is stored in compact flash.


    正确答案： A,B
    解析： 暂无解析

  • 第23题：

    多选题
    Which two statements are true about the forwarding table?（）
    A

    The forwarding table lists each source protocol and preference for each destination.

    B

    The forwarding table contains only active routes.

    C

    The forwarding table is used to process transit packets.

    D

    The forwarding table is stored in compact flash


    正确答案： D,A
    解析： 暂无解析

  • 第24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

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