多选题Which two are true about aggregate functions? （）AYou can use aggregate functions in any clause of a SELECT statement.BYou can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.CYou can mi

题目
多选题
Which two are true about aggregate functions? （）
A

You can use aggregate functions in any clause of a SELECT statement.

B

You can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.

C

You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.

D

You can pass column names, expressions, constants, or functions as parameters to an aggregate function.

E

You can use aggregate functions on a table, only by grouping the whole table as one single group.

F

You cannot group the rows of a table by more than one column while using aggregate functions.

相似考题

1.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

2.The EMP table contains these columns:You need to display the employees who have not been assigned to any department.You write the SELECT statement: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.

3.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.

4.Exhibit: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.

更多“多选题Which two are true about aggregate functions? （）AYou can use aggregate functions in any clause of a SELECT statement.BYou can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.CYou can mi”相关问题

  • 第1题：

    Which two statements are true about WHERE and HAVING clauses? （）

    • A、A WHERE clause can be used to restrict both rows and groups.
    • B、A WHERE clause can be used to restrict rows only.
    • C、A HAVING clause can be used to restrict both rows and groups.
    • D、A HAVING clause can be used to restrict groups only.
    • E、A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.
    • F、A HAVING clause CANNOT be used in subqueries.

    正确答案:B,D

  • 第2题：

    Which two are true about aggregate functions? （）

    • A、You can use aggregate functions in any clause of a SELECT statement.
    • B、You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.
    • C、You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
    • D、You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
    • E、You can use aggregate functions on a table, only by grouping the whole table as one single group.
    • F、You cannot group the rows of a table by more than one column while using aggregate functions.

    正确答案:A,D

  • 第3题：

    In which four clauses can a subquery be used? （）

    • A、in the INTO clause of an INSERT statement
    • B、in the FROM clause of a SELECT statement
    • C、in the GROUP BY clause of a SELECT statement
    • D、in the WHERE clause of a SELECT statement
    • E、in the SET clause of an UPDATE statement
    • F、in the VALUES clause of an INSERT statement

    正确答案:B,D,E,F

  • 第4题：

    Which two statements about views are true?（）

    • A、A view can be created as read only.
    • B、A view can be created as a join on two or more tables.
    • C、A view cannot have an ORDER BY clause in the SELECT statement.
    • D、A view cannot be created with a GROUP BY clause in the SELECT statement.
    • E、A view must have aliases defined for the column names in the SELECT statement.

    正确答案:A,B

  • 第5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.

    正确答案:C

  • 第6题：

    Which two statements are true regarding the USING and ON clauses in table joins?（）

    • A、Both USING and ON clauses can be used for equijoins and nonequijoins 
    • B、Amaximum of one pair of columns can be joined between two tables using the ON clause 
    • C、The ON clause can be used to join tables on columns that have different names but compatible data types 
    • D、The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause 

    正确答案:C,D

  • 第7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 clause

    B

    Before the WHERE clause

    C

    Before the FROM clause

    D

    After the ORDER BY clause

    E

    After the WHERE clause


    正确答案： D
    解析： 暂无解析

  • 第8题：

    多选题
    Which two are true about aggregate functions? （）
    A

    You can use aggregate functions in any clause of a SELECT statement.

    B

    You can use aggregate functions only in the column list of the SELECT clause and in the WHERE clause of a SELECT statement.

    C

    You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.

    D

    You can pass column names, expressions, constants, or functions as parameters to an aggregate function.

    E

    You can use aggregate functions on a table, only by grouping the whole table as one single group.

    F

    You cannot group the rows of a table by more than one column while using aggregate functions.


    正确答案： B,D
    解析： 暂无解析

  • 第9题：

    多选题
    Which two statements are true about WHERE and HAVING clauses? （）
    A

    A WHERE clause can be used to restrict both rows and groups.

    B

    A WHERE clause can be used to restrict rows only.

    C

    A HAVING clause can be used to restrict both rows and groups.

    D

    A HAVING clause can be used to restrict groups only.

    E

    A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.

    F

    A HAVING clause CANNOT be used in subqueries.


    正确答案： B,D
    解析： 暂无解析

  • 第10题：

    多选题
    Where can subqueries be used?（）
    A

    field names in the SELECT statement

    B

    the FROM clause in the SELECT statement

    C

    the HAVING clause in the SELECT statement

    D

    the GROUP BY clause in the SELECT statement

    E

    the WHERE clause in only the SELECT statement

    F

    the WHERE clause in SELECT as well as all DML statements


    正确答案： F,B
    解析： 暂无解析

  • 第11题：

    多选题
    Which two statements are true regarding the ORDER BY clause? （）
    A

    It is executed first in the query execution

    B

    It must be the last clause in the SELECT statement

    C

    It cannot be used in a SELECT statement containing a HAVING clause

    D

    You cannot specify a column name followed by an expression in this clause

    E

    You can specify a combination of numeric positions and column names in this clause


    正确答案： E,C
    解析： 暂无解析

  • 第12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.


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Which two statements about subqueries are true? （）

    • A、A subquery should retrieve only one row.
    • B、A subquery can retrieve zero or more rows.
    • C、A subquery can be used only in SQL query statements.
    • D、Subqueries CANNOT be nested by more than two levels.
    • E、A subquery CANNOT be used in an SQL query statement that uses group functions.
    • F、When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.

    正确答案:B,F

  • 第14题：

    Which two statements are true regarding the ORDER BY clause? （）

    • A、It is executed first in the query execution 
    • B、It must be the last clause in the SELECT statement 
    • C、It cannot be used in a SELECT statement containing a HAVING clause
    • D、You cannot specify a column name followed by an expression in this clause 
    • E、You can specify a combination of numeric positions and column names in this clause

    正确答案:B,E

  • 第15题：

    Which two statements are true regarding subqueries? （）

    • A、A subquery can retrieve zero or more rows 
    • B、Only two subqueries can be placed atone level 
    • C、A subquery can be used only in SQL query statements 
    • D、A subquery can appear on either side of a comparison operator 
    • E、There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement 

    正确答案:A,D

  • 第16题：

    Which three statements are true regarding single-row functions？（）

    • A、 They can accept only one argument.
    • B、 They can be nested up to only two levels.
    • C、 They can return multiple values of more than one data type.
    • D、 They can be used in SELECT， WHERE， and ORDER BY clauses.  
    • E、 They can modify the data type of the argument that is referenced.
    • F、 They can accept a column name， expression， variable name， or a user-supplied constant as arguments.

    正确答案:D,E,F

  • 第17题：

    Where can subqueries be used?（）

    • A、field names in the SELECT statement 
    • B、the FROM clause in the SELECT statement 
    • C、the HAVING clause in the SELECT statement
    • D、the GROUP BY clause in the SELECT statement 
    • E、the WHERE clause in only the SELECT statement 
    • F、the WHERE clause in SELECT as well as all DML statements

    正确答案:B,C,F

  • 第18题：

    多选题
    Which two statements are true regarding subqueries? （）
    A

    A subquery can retrieve zero or more rows

    B

    Only two subqueries can be placed atone level

    C

    A subquery can be used only in SQL query statements

    D

    A subquery can appear on either side of a comparison operator

    E

    There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement


    正确答案： E,B
    解析： 暂无解析

  • 第19题：

    多选题
    Which two statements are true regarding the USING and ON clauses in table joins?（）
    A

    Both USING and ON clauses can be used for equijoins and nonequijoins

    B

    Amaximum of one pair of columns can be joined between two tables using the ON clause

    C

    The ON clause can be used to join tables on columns that have different names but compatible data types

    D

    The WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause


    正确答案： A,C
    解析： 暂无解析

  • 第20题：

    多选题
    Which two statements about views are true?（）
    A

    A view can be created as read only.

    B

    A view can be created as a join on two or more tables.

    C

    A view cannot have an ORDER BY clause in the SELECT statement.

    D

    A view cannot be created with a GROUP BY clause in the SELECT statement.

    E

    A view must have aliases defined for the column names in the SELECT statement.


    正确答案： D,E
    解析： 暂无解析

  • 第21题：

    多选题
    In which four clauses can a subquery be used? （）
    A

    in the INTO clause of an INSERT statement

    B

    in the FROM clause of a SELECT statement

    C

    in the GROUP BY clause of a SELECT statement

    D

    in the WHERE clause of a SELECT statement

    E

    in the SET clause of an UPDATE statement

    F

    in the VALUES clause of an INSERT statement


    正确答案： C,D
    解析： 暂无解析

  • 第22题：

    多选题
    Which two statements about subqueries are true? （）
    A

    A subquery should retrieve only one row.

    B

    A subquery can retrieve zero or more rows.

    C

    A subquery can be used only in SQL query statements.

    D

    Subqueries CANNOT be nested by more than two levels.

    E

    A subquery CANNOT be used in an SQL query statement that uses group functions.

    F

    When a subquery is used with an inequality comparison operator in the outer SQL statement, the column list in the SELECT clause of the subquery should contain only one column.


    正确答案： C,D
    解析： 暂无解析

  • 第23题：

    多选题
    Which three statements are true regarding single-row functions？（）
    A

    They can accept only one argument.

    B

    They can be nested up to only two levels.

    C

    They can return multiple values of more than one data type.

    D

    They can be used in SELECT， WHERE， and ORDER BY clauses.

    E

    They can modify the data type of the argument that is referenced.

    F

    They can accept a column name， expression， variable name， or a user-supplied constant as arguments.


    正确答案： D,E
    解析： 暂无解析

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