Select the statement that best describes The cure for Amplification Principle in the Internetdomain, as explained in RFC 3429 (Internet Architectural Guidelines )()?
第1题:
A. Updating
B. Viewing
C. Deleting
D. Inserting
E. Truncating
第2题:
Evaluate this SQL statement:SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAMEFROM EMPLOYEES e, DEPARTMENTS dWHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID;In the statement, which capabilities of a SELECT statement are performed?()
A.selection, projection, join
B.difference, projection, join
C.selection, intersection, join
D.intersection, projection, join
E.difference, projection, product
第3题:
What is a sub-select statement?
A.a select statement that selects a subset of fields in a table
B.a select statement that returns a subset of the data in a table
C.a select statement that appears within another select statement
D.a select statement that returns a subset of the constraints on a field
第4题:
Which two statements about views are true? ()
第5题:
Which two statements are true regarding the ORDER BY clause? ()
第6题:
In a SELECT statement that includes a WHERE clause, where is the GROUP BY clause placed in the SELECT statement?()
第7题:
Alice only
Alice and Reena
Alice, Reena, and Timber
Sue, Alice, Reena, and Timber
第8题:
The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
The statement returns an error at the SELECT clause.
The statement returns an error at the WHERE clause.
The statement returns an error at the ORDER BY clause.
第9题:
A view can be created as read only.
A view can be created as a join on two or more tables.
A view cannot have an ORDER BY clause in the SELECT statement.
A view cannot be created with a GROUP BY clause in the SELECT statement.
A view must have aliases defined for the column names in the SELECT statement.
第10题:
You can use aggregate functions in any clause of a SELECT statement.
You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.
You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
You can use aggregate functions on a table, only by grouping the whole table as one single group.
You cannot group the rows of a table by more than one column while using aggregate functions.
第11题:
Immediately after the SELECT clause
Before the WHERE clause
Before the FROM clause
After the ORDER BY clause
After the WHERE clause
第12题:
Examine the description of the MARKS table:SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.Examine this SELECT statement based on the MARKS table:What is the result of the SELECT statement?()
A. The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
B. The statement returns an error at the SELECT clause.
C. The statement returns an error at the WHERE clause.
D. The statement returns an error at the ORDER BY clause.
第13题:
Click the Exhibit button and examine the data in the EMPLOYEES table.Examine the subquery:SELECT last_nameFROM employeesWHERE salary IN (SELECT MAX(salary)FROM employeesGROUP 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.
第14题:
In which four clauses can a subquery be used?()
第15题:
From SQL*Plus, you issue this SELECT statement: SELECT* FROM order; You use this statement to retrieve data from a data table for ().
第16题:
Where can subqueries be used?()
第17题:
Selection, projection, join
Difference, projection, join
Selection, intersection, join
Intersection, projection, join
Difference, projection, product
第18题:
The statement would not execute because table aliases are not allowed in the JOIN clause.
The statement would not execute because the table alias prefix is not used in the USING clause.
The statement would not execute because all the columns in the SELECT clause are not prefixed with table aliases.
The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list.
第19题:
Selection, projection, join
Difference, projection, join
Selection, intersection, join
Intersection, projection, join
Difference, projection, product
第20题:
in the INTO clause of an INSERT statement
in the FROM clause of a SELECT statement
in the GROUP BY clause of a SELECT statement
in the WHERE clause of a SELECT statement
in the SET clause of an UPDATE statement
in the VALUES clause of an INSERT statement
第21题:
Updating
Viewing
Deleting
Inserting
Truncating