Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）A、UniqueB、CheckC、ReferentialD、Informational

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第4题：

What type of constraint can be used to ensure that, in any given row in a table, the value of one column never exceeds the value of another column?（）

• A、Check
• B、Range
• C、Referential
• D、Informational

第5题：

What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?（）

• A、A check constraint on the EMPLOYEE table
• B、A unique constraint on the EMPLOYEE table WORKDEPT column
• C、A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table
• D、A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

第6题：

Given the following requirements: Create a table to contain employee data, with a unique numeric identifier automatically assigned when a row is added, has an EDLEVEL column that permits only the values 'C', 'H' and 'N', and permits inserts only when a corresponding value for the employee's department exists in the DEPARTMENT table. Which of the following CREATE statements will successfully create this table?（）

• A、CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED ALWAYS AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1), PRIMARY KEY emp_pk (empno), FOREIGN KEY emp_workdept_fk ON (workdept) REFERENCES department (deptno), CHECK edlevel_ck VALUES (edlevel IN ('C','H','N')), );
• B、CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK edlevel VALUES ('C','H','N') );
• C、CREATE TABLE emp ( empno SMALLINT NEXTVAL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3) NOT NULL, edlevel CHAR(1) CHECK IN ('C','H','N')), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY department (deptno) REFERENCES (workdept) );
• D、CREATE TABLE emp ( empno SMALLINT NOT NULL GENERATED BY DEFAULT AS IDENTITY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, workdept CHAR(3), edlevel CHAR(1), CONSTRAINT emp_pk PRIMARY KEY (empno), CONSTRAINT emp_workdept_fk FOREIGN KEY (workdept) REFERENCES department (deptno), CONSTRAINT edlevel_ck CHECK (edlevel IN ('C','H','N')) );

第7题：

Which two statements are true about the primary key constraint in a table？ （）

• A、It is not possible to disable the primary key constraint.
• B、It is possible to have more than one primary key constraint in a single table.
• C、The primary key constraint can be referred by only one foreign key constraint.
• D、The primary key constraint can be imposed by combining more than one column.
• E、The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.

第8题：

Which constraint can be defines only at the column level?（）

• A、UNIQUE
• B、NOT NULL
• C、CHECK
• D、PRIMARY KEY
• E、FOREIGN KEY

第9题：

Which two statements are true regarding single row functions?（）

• A、They accept only a single argument 
• B、They can be nested only to two levels 
• C、Arguments can only be column values or constants 
• D、They always return a single result row for every row of a queried table 
• E、They can return a data type value different from the one that is referenced

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Given the following ALTER SEQUENCE statement: ALTER SEQUENCE myseq RESTART WITH 0 INCREMENT BY 1 NO MAXVALUE CACHE 5 ORDER Assuming that the sequence had reached a value of 100 prior to the RESTART, which of the following is true?（）

• A、The next value will be 0 and the sequence will never use the values 101 to 105.
• B、The next value will be 101 to ensure uniqueness between existing and newly generated sequence values.
• C、Previously cached values are retained by DB2, and after the restart, will be used for values 101 to 105.
• D、The next value will be 0 and DB2 will not ensure uniqueness between existing and newly generated values.

第16题：

Which of the following scenarios will ensure that the value of the NEXT_STEPNO column in a given row of table TABLEX exists as a value of column STEPNO (usually in another row) in the same table?（）

• A、Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO.
• B、Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO).
• C、Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table.
• D、Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.

第17题：

Which of the following database objects can be used to raise an error if a table is updated?（）

• A、Package
• B、Trigger
• C、Stored Procedure
• D、Informational Constraint

第18题：

Which of the following can be used to ensure that once a row has been inserted in table TABLEX, the column MAINID in that row cannot be updated?（）

• A、Define the column MAINID as NOT UPDATABLE
• B、Define the column MAINID as a PRIMARY KEY
• C、Define the column MAINID as a FOREIGN KEY
• D、Define an UPDATE trigger on table TABLEX

第19题：

Which two statements are true about constraints? （）

• A、The UNIQUE constraint does not permit a null value for the column.
• B、A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.
• C、The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.
• D、The NOT NULL constraint ensures that null values are not permitted for the column.

第20题：

Which three statements are true regarding the data types in Oracle Database 10g/11g?（）

• A、Only one LONG column can be used per table 
• B、A TIMESTAMP data type column stores only time values with fractional seconds 
• C、The BLOB data type column is used to store binary data in an operating system file 
• D、The minimum column width that can be specified for a VARCHAR2 data type column is one 
• E、The value for a CHAR data type column is blank-padded to the maximum defined column width

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