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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
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更多 “多选题Where can subqueries be used?（）Afield names in the SELECT statementBthe FROM clause in the SELECT statementCthe HAVING clause in the SELECT statementDthe GROUP BY clause in the SELECT statementEthe WHERE clause in only the SELECT statementFthe WHERE clause in SELECT as well as all DML statements” 相关考题
考题
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
考题
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
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.
考题
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.
考题
In which of the following situations should correlation names be used?()
A.A table referenced in the FROM clause has no indexed column.B.The table referenced in the FROM clause has more than 200 columns.C.Two or more tables in the FROM clause have identical column names.D.The FROM clause contains two or more tables in the SELECT statement.
考题
In which of the following situations should correlation names be used?（）A、A table referenced in the FROM clause has no indexed column.B、The table referenced in the FROM clause has more than 200 columns.C、Two or more tables in the FROM clause have identical column names.D、The FROM clause contains two or more tables in the SELECT statement.
考题
对于满足SQL92标准的SQL语句： select foo，count（foo）from pokes where foo10group by foo having count （*）5 order by foo 其执行顺序应该是（）。A、FROM-WHERE-GROUP BY-HAVING-SELECT-ORDER BYB、FROM-GROUP BY-WHERE-HAVING-SELECT-ORDER BYC、FROM-WHERE-GROUP BY-HAVING-ORDER BY-SELECTD、FROM-WHERE-ORDER BY-GROUP BY-HAVING-SELECT
考题
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
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.
考题
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.
考题
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 clauseD、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
考题
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
考题
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
考题
Click the Exhibit button and examine the data in the EMPLOYEES table. Which three subqueries work?（）A、SELECT * FROM employees where salary (SELECT MIN(salary) FROM employees GROUP BY department_id);B、SELECT * FROM employees WHERE salary = (SELECT AVG(salary) FROM employees GROUP BY department_id);C、SELECT distinct department_id FROM employees WHERE salary ANY (SELECT AVG(salary) FROM employees GROUP BY department_id);D、SELECT department_id FROM employees WHERE salary ALL (SELECT AVG(salary) FROM employees GROUP BY department_id);E、SELECT last_name FROM employees WHERE salary ANY (SELECT MAX(salary) FROM employees GROUP BY department_id);F、SELECT department_id FROM employees WHERE salary ALL (SELECT AVG(salary) FROM employees GROUP BY AVG(SALARY));
考题
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.
考题
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 statementD、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
考题
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
考题
多选题Which two statements are true regarding subqueries? （）AA subquery can retrieve zero or more rowsBOnly two subqueries can be placed atone levelCA subquery can be used only in SQL query statementsDA subquery can appear on either side of a comparison operatorEThere is no limit on the number of subquery levels in the WHERE clause of a SELECT statement
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
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
考题
多选题Which two statements are true regarding the USING and ON clauses in table joins?（）ABoth USING and ON clauses can be used for equijoins and nonequijoinsBAmaximum of one pair of columns can be joined between two tables using the ON clauseCThe ON clause can be used to join tables on columns that have different names but compatible data typesDThe WHERE clause can be used to apply additional conditions in SELECT statements containing the ON or the USING clause
考题
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 mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.DYou can pass column names, expressions, constants, or functions as parameters to an aggregate function.EYou can use aggregate functions on a table, only by grouping the whole table as one single group.FYou cannot group the rows of a table by more than one column while using aggregate functions.
考题
多选题Which two statements about views are true?（）AA view can be created as read only.BA view can be created as a join on two or more tables.CA view cannot have an ORDER BY clause in the SELECT statement.DA view cannot be created with a GROUP BY clause in the SELECT statement.EA view must have aliases defined for the column names in the SELECT statement.
考题
多选题Which two statements are true about WHERE and HAVING clauses? （）AA WHERE clause can be used to restrict both rows and groups.BA WHERE clause can be used to restrict rows only.CA HAVING clause can be used to restrict both rows and groups.DA HAVING clause can be used to restrict groups only.EA WHERE clause CANNOT be used in a query of the query uses a HAVING clause.FA HAVING clause CANNOT be used in subqueries.
考题
多选题In which four clauses can a subquery be used? （）Ain the INTO clause of an INSERT statementBin the FROM clause of a SELECT statementCin the GROUP BY clause of a SELECT statementDin the WHERE clause of a SELECT statementEin the SET clause of an UPDATE statementFin the VALUES clause of an INSERT statement
考题
多选题Where can subqueries be used?（）Afield names in the SELECT statementBthe FROM clause in the SELECT statementCthe HAVING clause in the SELECT statementDthe GROUP BY clause in the SELECT statementEthe WHERE clause in only the SELECT statementFthe WHERE clause in SELECT as well as all DML statements
考题
多选题Which two statements are true regarding the ORDER BY clause? （）AIt is executed first in the query executionBIt must be the last clause in the SELECT statementCIt cannot be used in a SELECT statement containing a HAVING clauseDYou cannot specify a column name followed by an expression in this clauseEYou can specify a combination of numeric positions and column names in this 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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