Which statement regarding triggers is true、

试卷相关题目

• 1Which statement is true about an index that is used to support a UNIQUE constraint、

  A.It must not contain more than one column.

  B.It cannot be used in a referential constraint.

  C.It must be defined with the UNIQUE attribute.

  D.It must be defined as UNIQUE WHERE NOT NULL.

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• 2Which privilege is required to invoke a user defined function、

  A.CALL

  B.USAGE

  C.EXECUTE

  D.REFERENCES

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• 3A new user named USER1 needs to retrieve information from a database named MYDB. Whatauthority must be granted to user USER1、

  A.DBCTRL authority

  B.SQLADM authority

  C.DATAACCESS authority

  D.ACCESSCTRL authority

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• 4Which SQL statement will allow user USER1 to create a view on a table named EMPLOYEE、

  A.GRANT CREATETAB ON DATABASE TO user1

  B.GRANT SELECT ON TABLE employee TO user1

  C.GRANT CREATEVIEW ON DATABASE TO user1

  D.GRANT REFERENCES ON TABLE employee TO user1

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• 5A table named EMPLOYEE was created as follows:  CREATE TABLE employee  (emp_id INTEGER NOT NULL PRIMARY KEY,   f_name VARCHAR(30),   l_name VARCHAR(40),   ssn    CHAR(9) NOT NULL) Which action will prevent unauthorized users from accessing SSN data、

  A.Assign the SSN column to a restricted role that only authorized users can access.

  B.Only grant ACCESSCTRL authority for the SSN column to users who need to access SSN data.

  C.Alter the table definition so that SSN data is stored in a separate schema that only authorized users can access.

  D.Create a view for the EMPLOYEE table that does not contain the SSN column and requireunauthorized users to use the view.

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• 6A table named STATES was created as follows:  CREATE TABLE states  (state_cd     CHAR(2) NOT NULL,   state_desc   CHAR(20)); CREATE UNIQUE INDEX indx1 ON states (state_cd); What will happen、

  A.An error will be returned and the operation will fail.

  B.A warning will be returned and the unique index INDX1 will become the index for the primary key.

  C.The primary key will be successfully added and the unique index INDX1 will be dropped and recreatedas the primary key index.

  D.The primary key will be successfully added, the unique index INDX1 will be dropped, and a new indexwill be created for the primary key.

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• 7When an application using a temporary table terminates or disconnects from the databaseunexpectedly, what happens to the temporary table and any data stored in it、

  A.The data in the table is deleted and the table persists.

  B.The data in the table is deleted and the table is implicitly dropped.

  C.The temporary table is converted to a base table and the data is delete

  D.D. The temporary table is converted to a base table and the data is persistent.

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• 8When a user-defined function (UDF) is created and no schema is specified, what schema is used to store the UDF、

  A.The SYSIBM schema.

  B.The SYSFUN schema.

  C.A schema with the name of the UDF.

  D.A schema with the userid of the UDF definer.

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• 9Which statement about triggers is true、

  A.A trigger is designed to return specific types of values and contains executable code.

  B.A trigger is designed to return specific types of values but contains no executable code.

  C.A trigger performs actions to capture details about an activity like a join operation against multiple tables.

  D.A trigger performs actions in response to an event like an INSERT, UPDATE or DELETE operation on a tabl

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• 10Which two statements are true about foreign key constraints、 (Choose two.)

  A.The foreign key constraint columns must be supported by an index.

  B.The foreign key constraint columns must be defined as NOT NULL.

  C.The number and data types of foreign key constraint columns must match the parent key.

  D.The columns of one foreign key constraint cannot be used in another foreign key constraint.

  E.To define a foreign key constraint there must be an associated primary key or unique key in the same or different table.

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