A2090-730試験無料問題集「IBM Assessment: DB2 9 Family Fundamentals 認定」
A table contains a list of all seats available at a football stadium. A seat consists of a section number, a seat number, and whether or not the seat has been assigned. A ticket agent working at the box office generates a list of all unassigned seats. When the agent refreshes the list, it should only change if another agent assigns one or more unassigned seats. Which of the following is the best isolation level to use for this application?
正解：D
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Given the following queries:
SELECT c1 FROM tab1; SELECT c1 FROM tab2;
Which of the following set operators can be used to produce a result data set that contains only records that are not found in the result data set produced by each query after duplicate rows have been eliminated?
SELECT c1 FROM tab1; SELECT c1 FROM tab2;
Which of the following set operators can be used to produce a result data set that contains only records that are not found in the result data set produced by each query after duplicate rows have been eliminated?
正解：D
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The following triggers were defined for a table named SALES in the order shown:
CREATE TRIGGER trigger_a NO CASCADE BEFORE UPDATE ON sales REFERENCING NEW AS new FOR EACH ROW SET new.commission = sale_amt * .05 WHERE invoice = n.invoice;
CREATE TRIGGER trigger_b AFTER INSERT ON sales REFERENCING NEW AS new FOR EACH ROW UPDATE sales SET bill_date = CURRENT DATE + 30 DAYS WHERE invoice = n.invoice;
CREATE TRIGGER trigger_c NO CASCADE BEFORE DELETE ON sales FOR EACH ROW SIGNAL SQLSTATE '75005' SET MESSAGE_TEXT = 'Deletes not allowed!';
Which of the following statements is NOT true?
CREATE TRIGGER trigger_a NO CASCADE BEFORE UPDATE ON sales REFERENCING NEW AS new FOR EACH ROW SET new.commission = sale_amt * .05 WHERE invoice = n.invoice;
CREATE TRIGGER trigger_b AFTER INSERT ON sales REFERENCING NEW AS new FOR EACH ROW UPDATE sales SET bill_date = CURRENT DATE + 30 DAYS WHERE invoice = n.invoice;
CREATE TRIGGER trigger_c NO CASCADE BEFORE DELETE ON sales FOR EACH ROW SIGNAL SQLSTATE '75005' SET MESSAGE_TEXT = 'Deletes not allowed!';
Which of the following statements is NOT true?
正解：C
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The following SQL statements were executed in sequence:
CREATE DISTINCT TYPE salary AS decimal(7,2) WITH COMPARISONS;
CREATE TABLE staffsalary(empid INT, empsalary salary);
INSERT INTO staffsalary VALUES (10, 50000), (20, 50000.00);
UPDATE staffsalary SET empsalary = 60000
WHERE salary(50000) = empsalary;
What is the current content of the staffsalary table?
CREATE DISTINCT TYPE salary AS decimal(7,2) WITH COMPARISONS;
CREATE TABLE staffsalary(empid INT, empsalary salary);
INSERT INTO staffsalary VALUES (10, 50000), (20, 50000.00);
UPDATE staffsalary SET empsalary = 60000
WHERE salary(50000) = empsalary;
What is the current content of the staffsalary table?
正解：A
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