单项选择题
Which of the following constraint types can be used to ensure the value of an INTEGER column references only positive values?（）
A.Unique
B.Check
C.Referential
D.Informational
相关考题
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单项选择题
A view is created with the following statement:CREATE VIEW v1 AS SELECT col1, col2, col3 FROM t1 WHERE col4 > 1000 ; When will DB2 access the data from table T1 for view V1?（）
A.When view V1 is created
B.Each time the REFRESH VIEW v1 statement is executed
C.Each time an SQL statement is executed against view V1
D.Only the first time an SQL statement is executed against view V1 -
单项选择题
A table was created using the following DDL: CREATE TABLE employee (id SMALLINT NOT NULL, name VARCHAR(9), dept SMALLINT CHECK (dept BETWEEN 10 AND 100), job CHAR(10) CHECK (job IN (Sales,Mgr,Clerk)), hiredate DATE, salary DECIMAL(7,2), comm DECIMAL(7,2), PRIMARY KEY (id), CONSTRAINT yearsal CHECK (YEAR(hiredate) > 2004 OR salary > 80500) ); Which of the following INSERT statements will fail?（）
A.INSERT INTO employee VALUES (2, 'Smith', 80, 'Mgr', '09/03/2006', 80000, NULL)
B.INSERT INTO employee VALUES (4, 'Smith', 86, 'Mgr', '07/14/2003', 90000, NULL)
C.INSERT INTO employee VALUES (1, 'Smith', 55, 'Sales', '07/14/2003', NULL, NULL)
D.INSERT INTO employee VALUES (3, 'Smith', 33, 'Analyst', '11/26/2006', 90000, NULL) -
单项选择题
An application needs a table for each connection that tracks the ID and Name of all items previously ordered and committed within the connection. The table also needs to be cleaned up and automatically removed each time a connection is ended. Assuming the ITEMS table was created with the following SQL statement: CREATE TABLE items item_no INT, item_name CHAR(5), item_qty INT) Which of the following SQL statements will provide the table definition that meets the specified requirements?（）
A.DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE
B.DECLARE GLOBAL TEMPORARY TABLE tracker AS (SELECT item_no, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS
C.CREATE TABLE systmp.tracker AS (SELECT item_num, item_name FROM items) WITH NO DATA ON COMMIT PRESERVE ROWS
D.CREATE TABLE tracker AS (SELECT item_num, item_name FROM items) ON COMMIT PRESERVE ROWS ON DISCONNECT DROP TABLE
