专业技术初级资格程序员基础知识DB2

试卷预览

• 101A table named SALES contains a record for every sales transaction a company processes. A user wishes to see the number of transactions that are made by each salesman. Which SQL statement will produce the desired results、

  A.SELECT name, COUNT(*) AS transactions FROM sales

  B.SELECT name, COUNT(DISTINCT name) AS transactions FROM sales

  C.SELECT name, COUNT(*) AS transactions FROM sales GROUP BY name

  D.SELECT DISTINCT name, COUNT(*) AS transactions FROM sales GROUP BY transactions

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• 102Which statement about roll back operations is correct、

  A.When a ROLLBACK statement is executed, all locks held by the terminating transaction are released.

  B.When a ROLLBACK TO SAVEPOINT statement is executed, all locks acquired up to the savepoint are released.

  C.When a ROLLBACK TO SAVEPOINT statement is executed, all locks acquired after the savepoint are release

  D.D. When a ROLLBACK statement is executed, all locks acquired for open cursors that were declared WITH HOLD, are held.

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• 103When a COMMIT statement is executed, what happens、

  A.All locks held on the database are automatically released.

  B.Data stored in global temporary tables is automatically deleted.

  C.Open cursors defined WITH HOLD are closed, but their data is retaine

  D.D. The current transaction is terminated and a new transaction boundary is started.

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• 104Which SQL statement would be used to retrieve only salaries that are greater than $100,000.00 from a table named EMPLOYEE、

  A.SELECT * FROM employee WHERE salary < 100000

  B.SELECT salary FROM employee WHERE salary > 100000

  C.SELECT salary FROM employee WHERE salary > 100,000.00

  D.SELECT * FROM employee WHERE salary GREATER THAN 100000

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• 105Which SQL statement should be used to retrieve the minimum and maximum salaries (SALARY) for each job code (JOB), sorted by job code, from a table named EMPLOYEE、

  A.SELECT job, MIN(salary), MAX(salary) FROM employee GROUP BY job ORDER BY job;

  B.SELECT job, MIN(salary), MAX(salary) FROM employee ORDER BY job;

  C.SELECT job, MIN(salary), MAX(salary) FROM employee GROUP BY SALARY ORDER BY job;

  D.SELECT job, MIN(salary), MAX(salary) FROM employee GROUP BY MIN(salary), MAX(salary)ORDER BY job;

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• 106If a table named MY_TAB contains 100 rows and the following statement is executed:  UPDATE  (SELECT * FROM my_tab   ORDER BY col1 DESC   FETCH FIRST 10 ROWS ONLY) AS temp   SET col3 = 99; How many rows will be updated、

  A.0

  B.1

  C.10

  D.99

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• 107An SQL function named DEPT_INFO was created as follows:  CREATE FUNCTION dept_info()  RETURNS TABLE(dept_id INTEGER,dept_name VARCHAR(20))  LANGUAGE SQL  READS SQL DATA  BEGIN ATOMIC  RETURN    SELECT deptno,deptname FROM department WHERE deptname LIKE 'S%';  END What is the correct way to use this function in a query、

  A.SELECT dept_info(dept_id, dept_name)

  B.SELECT dept_id, dept_name FROM dept_info()

  C.SELECT TABLE dept_id, dept_name FROM dept_info()

  D.SELECT dept_id, dept_name FROM TABLE(dept_info()) AS results

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• 108Which type of stored procedure is not associated with an external application program、

  A.A Java stored procedure.

  B.A REXX stored procedure.

  C.A native SQL stored procedure.

  D.An external SQL stored procedur

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• 109Which SQL statement will retrieve the department number (WORKDEPT) and average departmentalsalary (SALARY) for all departments in a table named EMPLOYEE and arrange the result set inascending order by average departmental salary、

  A.SELECT workdept, AVG(salary) FROM employee ORDER BY workdept GROUP BY 2

  B.SELECT workdept, AVG(salary) FROM employee ORDER BY workdept ARRANGE BY 2

  C.SELECT workdept, AVERAGE(salary) FROM employee GROUP BY workdept ORDER BY 2

  D.SELECT workdept, AVG(salary) FROM employee GROUP BY workdept ORDER BY 2

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• 110Which statement about system-period temporal tables is true、

  A.They store user-based period information.

  B.They do not have a separate history table.

  C.They can be queried without a time period specification.

  D.They manage data based on time criteria specified by users or applications.

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