If a table named MY_TAB contains 100 rows and the following statement is executed:  DELETE FROM   (SELECT * FROM my_tab   ORDER BY col1 DESC   FETCH FIRST 5 ROWS ONLY) AS tmp; What will happen、

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• 1An SQL function designed to convert temperatures from Fahrenheit to Celsius was created as follows:  CREATE FUNCTION conv_temp(IN temp_f FLOAT)  RETURNS INTEGER  NO EXTERNAL ACTOIN  SPECIFIC convert_ftoc  RETURN INT((temp_f-32)/1.8) How can this function be used to convert average temperature (AVG_TEMP) data stored in a table called CLIMATE_INFO、

  A.CALL conv_temp(climate_info.avg_temp);

  B.CALL convert_ftoc(climate_info.avg_temp);

  C.SELECT conv_temp(avg_temp) FROM climate_info;

  D.SELECT convert_ftoc(avg_temp) FROM climate_info;

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• 2Which command is used to back out a subset of database changes that have been made within a unit of work、

  A.COMMIT

  B.ROLLBACK

  C.COMMIT TO SAVEPOINT

  D.ROLLBACK TO SAVEPOINT

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• 3When 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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• 4Which operation normally does NOT require an exclusive lock、

  A.BIND

  B.DROP

  C.GRANT

  D.SELECT

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• 5What isolation level prevents dirty reads, nonrepeatable reads, and phantoms、

  A.Read stability (RS)

  B.Cursor stability (CS)

  C.Repeatable read (RR)

  D.Uncommitted read (UR)

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• 6Given an EMPLOYEES table and a SALES table, a user wants to produce a list of all employees and their associated revenue, even if no revenue exists. Which SQL statement will produce the desired list、

  A.SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON employees.id =sales.emp_id

  B.SELECT employees.name, sales.revenue FROM employees INNER JOIN sales ON sales.emp_id =employees.id

  C.SELECT employees.name, sales.revenue FROM sales LEFT OUTER JOIN employees ONemployees.id = sales.emp_id

  D.SELECT employees.name, sales.revenue FROM sales RIGHT OUTER JOIN employees ONemployees.id = sales.emp_id

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• 7Which two operations are allowed in the body of an SQL scalar user-defined function、 (Choose two.)

  A.CALL statements.

  B.External file access.

  C.Use of a scratch pa

  D.D.COMMIT statements.

  E.SQL control statements.

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• 8Which command will delete all rows from a table without generating log records、

  A.TRIM

  B.DROP

  C.DELETE

  D.TRUNCATE

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• 9Which function can be used to obtain values from XML documents that are to be inserted into one or more tables、

  A.XMLTABLE

  B.XMLPARSE

  C.XMLEXISTS

  D.XMLATTRIBUTES

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• 10User USER1 wants to retrieve records from a table named EMPLOYEE that satisfy at least one of the following criteria:-The employee's hire date (HIREDATE) is before 1999 and the employee's salary (SALARY) is less than $40,000.00 a year. -The employee has attended universityWhich SQL statement will accomplish this、

  A.SELECT * FROM employee WHERE (hiredate < '1999-01-01' AND salary < 40000) OR (education ='University')

  B.SELECT * FROM employee WHERE (hiredate < '1999-01-01') OR (salary < 40000) OR (education ='University')

  C.SELECT * FROM employee WHERE (hiredate < '1999-01-01' OR (salary < 40000 AND (education ='University')

  D.SELECT * FROM employee WHERE (hiredate < '1999-01-01' AND salary < 40000 AND (education ='University')

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