The EMPLOYEES table contains these col...

单项选择题 The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
LAST_NAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
You want to search for strings that contain 'SA_' in the JOB_ID column. Which SQL statement do you use?（）

A.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA\_%' ESCAPE '\';
B.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_';
C.SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_' ESCAPE "\";
D.SELECT employee_id, last_name, job_id FROM employees WHERE job_id = '%SA_';

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1.单项选择题What does the FORCE option for creating a view do?（）

A.creates a view with constraints
B.creates a view even if the underlying parent table has constraints
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D.creates a view regardless of whether or not the base tables exist

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2.单项选择题What is true about updates through a view?（）

A.You cannot update a view with group functions.
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C.When you update a view only the constraints on the underlying table will be in effect.
D.When you update a view the constraints on the views always override the constraints on the underlying tables.

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3.单项选择题 Click the Exhibit button and examine the data from the ORDERS and CUSTOMERS tables.
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4.单项选择题 The EMP table contains these columns:
EMPLOYEE_ID NUMBER(4)
EMPNAME VARCHAR2 (25)
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HIRE_DATE DATE
You query the database with this SQL statement:
SELECT empname,hire_date HIREDATE, salary
FROM EMP
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A.randomly
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C.descending by date
D.ascending alphabetically
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5.单项选择题Which is an iSQL*Plus command?（）

A.INSERT
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6.单项选择题Which iSQL*Plus feature can be used to replace values in the WHERE clause?（）

A.substitution variables
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7.多项选择题Which four statements correctly describe functions that are available in SQL? （）

A.INSTR returns the numeric position of a named character.
B.NVL2 returns the first non-null expression in the expression list.
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8.单项选择题 Examine the description of the EMPLOYEES table:
EMP_ID NUMBER(4) NOT NULL LAST_
NAME VARCHAR2(30) NOT NULL
FIRST_NAME VARCHAR2(30)
DEPT_ID NUMBER(2)
JOB_CAT VARCHAR2(30)
SALARY NUMBER(8,2)
Which statement shows the department ID, minimum salary, and maximum salary paid in that department, only if the minimum salary is less than 5000 and maximum salary is more than 15000?（）

A.SELECT dept_id, MIN(salary), MAX(salary) FROM employees WHERE MIN(salary) < 5000 AND MAX(salary) > 15000;
B.SELECT dept_id, MIN(salary), MAX(salary) FROM employees WHERE MIN(salary) < 5000 AND MAX(salary) > 15000 GROUP BY dept_id;
C.SELECT dept_id, MIN(salary), MAX(salary) FROM employees HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;
D.SELECT dept_id, MIN(salary), MAX(salary) FROM employees GROUP BY dept_id HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;
E.SELECT dept_id, MIN(salary), MAX(salary) FROM employees GROUP BY dept_id, salary HAVING MIN(salary) < 5000 AND MAX(salary) > 15000;

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9.多项选择题Which are DML statements? （）

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10.单项选择题In which case would you use a FULL OUTER JOIN?（）

A.Both tables have NULL values.
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E.One of the tables has more data than the other.
F.You want all matched and unmatched data from only one table.

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