What is the primary purpose of a view、-最需题库

试卷相关题目

1Which 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.
开始考试点击查看答案
2Which 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
开始考试点击查看答案
3When 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.
开始考试点击查看答案
4When 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.
开始考试点击查看答案
5A 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.
开始考试点击查看答案
6By default, a column defined as a TIMESTAMP includes which attributes、
A.No fractional digits or time zone.
B.6 fractional digits and no time zone.
C.12 fractional digits plus a time zone.
D.12 fractional digits and no time zon
开始考试点击查看答案
7Which is NOT a valid reason for creating an index、
A.To allow queries to run more efficiently.
B.To enforce constraints such as uniqueness on index keys.
C.To order the columns of a table in ascending or descending sequence according to values in a row.
D.To order the rows of a table in ascending or descending sequence according to the values in a column.
开始考试点击查看答案
8Which type of constraint can be used to ensure that an INTEGER column in a table will never be assigned more than one record that contains a NULL value、
A.Unique constraint
B.Primary key constraint
C.Informational constraint
D.Column default constraint
开始考试点击查看答案
9Which statement is true regarding constraints、
A.A table can only have one unique key constraint.
B.A table can have multiple primary key constraints.
C.Informational constraints tell DB2 what rules the data conforms to, but the rules are not enforce
D.D. Foreign key constraints are enforced on the values within the rows of a table, or between the rows of two tables, by a unique index on a foreignkey.
开始考试点击查看答案
10By default, where is the data stored for a column defined with an XML data type、
A.In an XML index.
B.In line with the rest of the data for the table.
C.In an XML storage object that is separate from the table.
D.In line with the rest of the data for the table, for XML columns less than 32KB.
开始考试点击查看答案