tailieunhanh - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P47

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P47:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 416 9. Choose one false statement about the ORDER BY clause. Choose the best answer. A. When using the ORDER BY clause it always appears as the last clause in a SELECT statement. B. The ORDER BY clause may appear in a SELECT statement that does not contain a WHERE clause. C. The ORDER BY clause specifies one or more terms by which the retrieved rows are sorted. These terms can only be column names. D. Positional sorting is accomplished by specifying the numeric position of a column as it appears in the SELECT list in the ORDER BY clause. 10. When using ampersand substitution variables in the following query how many times will you be prompted to input a value for the variable called JOB the first time this query is executed SELECT FIRST_NAME JOB FROM EMPLOYEES WHERE JOB_ID LIKE JOB AND JOB BETWEEN A AND Z Choose the best answer. A. 0 B. 1 C. 2 D. 3 Self Test Answers 1. 0 B. A projection is an intentional restriction of the columns returned from a table. 0 A C and D. A is eliminated since the question has nothing to do with duplicates distinctiveness or uniqueness of data. C incorrectly selects nonexistent columns called DEPT_NAME and LOC_ID from a nonexistent table called DEPT. D returns just one of the requested columns DEPARTMENT_NAME. Instead of additionally projecting the LOCATION_ID column from the DEPARTMENTS table it attempts to alias the DEPARTMENT_NAME column as LOCATION_ID. 2. 0 A and C. Columns with the NUMBER 8 2 data type can store at most eight digits of which at most two of those digits are to the right of the decimal point. Although A and C are the correct answers note that since the question is phrased in the negative these values are not allowed to be stored in such a column. A and C are not allowed because they contain eight and seven whole number digits respectively but the data type is constrained to store six whole number digits and two fractional digits. Chapter 9 Retrieving Restricting and .

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