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单选题
In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?（）
A
Immediately after the SELECT clause
B
Before the WHERE clause
C
Before the FROM clause
D
After the ORDER BY clause
E
After the WHERE clause
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In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement? ()
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In which four clauses can a subquery be used?（）A、in the INTO clause of an INSERT statementB、in the FROM clause of a SELECT statementC、in the GROUP BY clause of a SELECT statementD、in the WHERE clause of a SELECT statementE、in the SET clause of an UPDATE statementF、in the VALUES clause of an INSERT statement
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多选题Evaluate this SQL statement: SELECT e.emp_name, d.dept_name FROM employees e JOIN departments d USING (department_id) WHERE d.department_id NOT IN (10,40) ORSER BY dept_name; The statement fails when executed. Which change fixes the error?（）Aremove the ORDER BY clauseBremove the table alias prefix from the WHERE clauseCremove the table alias from the SELECT clauseDprefix the column in the USING clause with the table aliasEprefix the column in the ORDER BY clause with the table aliasFreplace the condition d.department_id NOT IN (10,40) in the WHERE clause with d.department_id 10 AND d.department_id 40
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单选题The EMP table contains these columns: LAST NAME VARCHAR2(25) SALARY NUMBER(6,2) DEPARTMENT_ID NUMBER(6) You need to display the employees who have not been assigned to any department. You write the SELECT statement: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARMENT_ID = NULL; What is true about this SQL statement?（）A
The SQL statement displays the desired results.B
The column in the WHERE clause should be changed to display the desired results.C
The operator in the WHERE clause should be changed to display the desired results.D
The WHERE clause should be changed to use an outer join to display the desired results.
考题
单选题The EMP table contains these columns: LAST_NAME VARCHAR2 (25) SALARY NUMBER (6,2) DEPARTMENT_ID NUMBER (6) You need to display the employees who have not been assigned to any department. You write the SELECT statement: SELECT LAST_NAME, SALARY, DEPARTMENT_ID FROM EMP WHERE DEPARTMENT_ID = NULL; What is true about this SQL statement ?（）A
The SQL statement displays the desired results.B
The column in the WHERE clause should be changed to display the desired results.C
The operator in the WHERE clause should be changed to display the desired results.D
The WHERE clause should be changed to use an outer join to display the desired results.
考题
单选题In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement? （）A
Immediately after the SELECT clauseB
Before the WHERE clauseC
Before the FROM clauseD
After the ORDER BY clauseE
After the WHERE clause
考题
单选题Exhibit: Examine the data in the EMPLOYEES table. Examine the subquery: SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id); Which statement is true?（）A
The SELECT statement is syntactically accurate.B
The SELECT statement does not work because there is no HAVING clause.C
The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.D
The SELECT statement does not work because the GROUP BY clause should be in the main query and not in the subquery.
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