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 t

题目

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.

参考答案和解析

正确答案:A,B

更多“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 t”相关问题

第1题

Which best describes an inline view?（）A、a schema objectB、a subquery that can contain an ORDER BY clauseC、another name for a view that contains group functionsD、a subquery that is part of the FROM clause of another query

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第2题

Which two statements are true about simple views？（）A、Views can be created as read only.B、Views are data segments like tables.C、Views can be created on the basis of more than one table.D、Data manipulation language （DML） operations cannot be performed on views.

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第3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

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第4题

View this parameter setting in your database： DB_CREATE_FILE_DEST=’D:// /oracle/product/10.2.0/oradata/oracle’ You created a tablespace by using this command： CREATE TABLESPACE USERS； Which two statements are true about the USERS tablespace？（）A、The tablespace has two data files.B、An error is reported and tablespace creation fails.C、Data files are created with names generated by the instance.D、The tablespace can be extended without specifying the data file.E、Data files belonging to the USERS tablespace cannot be renamed.

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第5题

Which two statements about creating constraints are true? （）A、Constraint names must start with SYS_CB、All constraints must be defines at the column levelC、Constraints can be created after the table is createdD、Constraints can be created at the same time the table is createdE、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view

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第6题

Which two are true regarding external tables？（）A、External tables can be updated. B、External tables are read-only tables. C、Indexes can be created on external tables. D、Indexes cannot be created on external tables.

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第7题

Which two statements about creating constraints are true?（）A、Constraint names must start with SYS_CB、All constraints must be defines at the column level.C、Constraints can be created after the table is created.D、Constraints can be created at the same time the table is created.E、Information about constraints is found in the VIEW_CONSTRAINTS dictionary view.

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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 t

题目

参考答案和解析

更多“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 t”相关问题

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