单选题A UDT is a data type which:（）A must contain unique values.B cannot be CAST to other data types.C is created using the CREATE DISTINCT command.D contains a value that was automatically calculated from values in other columns.

题目

单选题

A UDT is a data type which:（）

must contain unique values.

cannot be CAST to other data types.

is created using the CREATE DISTINCT command.

contains a value that was automatically calculated from values in other columns.

参考答案和解析

正确答案： C

解析：暂无解析

更多“单选题A UDT is a data type which:（）A must contain unique values.B cannot be CAST to other data types.C is created using the CREATE DISTINCT command.D contains a value that was automatically calculated from values in other columns.”相关问题

第1题

A UDT is a data type which:（）A、must contain unique values.B、cannot be CAST to other data types.C、is created using the CREATE DISTINCT command.D、contains a value that was automatically calculated from values in other columns.

点击查看答案
第2题

The EMPLOYEES table has these columns: LAST NAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement: ALTER TABLE EMPLOYEES MODIFY ( SALARY DEFAULT 5000); What is true about your ALTER statement?（）A、Column definitions cannot be altered to add DEFAULT values.B、A change to the DEFAULT value affects only subsequent insertions to the table.C、Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.D、All the rows that have a NULL value for the SALARY column will be updated with the value 5000.

点击查看答案
第3题

In which case would you use a FULL OUTER JOIN?（）A、Both tables have NULL values.B、You want all unmatched data from one table.C、You want all matched data from both tables.D、You want all unmatched data from both tables.E、One of the tables has more data than the other.F、You want all matched and unmatched data from only one table.

点击查看答案
第4题

The accounting manager wants you to create a form that when queried will display a calculated total of year-to-date actual expenditures for the fund code entered. The value needed to generate this summary data are stored in multiple tables. How would you define the data source for this data block without having the DBA create a database object? （）A、Choose Tools -> Data Block Wizard, select View as the data source type, and base the block on the columns from the bales. B、Choose Tools -> Data Block Wizard, select Table as the data source type, and base the block on the columns from the tables. C、Select the Data Blocks node in the Object Navigator and click the Create button. Choose to build the data block manually and alter the Query Data Source Columns and Query Data Source Arguments properties to enter the SELECT statement. D、Select the Data Blocks node in the Object Navigator and click the Create button. Choose to build the data block manually, alter the Query Data Source Type property to 'Table', and enter the SELECT statement in the Query Data Source Name property. E、Choose Tools -> Data Block Wizard, select Stored Procedure as the data source type, and base the block on the columns the tables. F、Select the Data Blocks node in the Object Navigator and click the Create button. Choose to build the data block manually. Alter the Query Data Source Type to 'FROM' clause query', and enter the SELECT statement in the Query Data Source Name property.

点击查看答案
第5题

Which two statements are true about a bitmap index？（）A、It is recommended for the columns that have unique values.B、It can be converted to a B-tree index by using the ALTER INDEX command.C、It has a bitmap segment for each distinct value in the key column， containing a string of bits in which each bit represents the presence or absence of a key column value.D、Updating the key column locks the whole bitmap segment that contains the bit for the key value to be updated.

点击查看答案
第6题

Which two statements regarding a SQL profile are true？（）A、 It is built by Automatic Tuning Optimizer.B、 It cannot be stored persistently in the data dictionary.C、 It can be used by the query optimizer automatically.D、 It can be created manually by using the CREATE PROFILE command.

点击查看答案
第7题

In which two scenarios do you use SQL* Loader to load data?（）A、Transform the data while it is being loaded into the database.B、Use transparent parallel processing without having to split the external data first.C、Load data into multiple tables during the same load statement.D、Generate unique sequential key values in specified columns.

点击查看答案

单选题A UDT is a data type which:（）A must contain unique values.B cannot be CAST to other data types.C is created using the CREATE DISTINCT command.D contains a value that was automatically calculated from values in other columns.

题目

参考答案和解析

更多“单选题A UDT is a data type which:（）A must contain unique values.B cannot be CAST to other data types.C is created using the CREATE DISTINCT command.D contains a value that was automatically calculated from values in other columns.”相关问题

第1题

第2题

第3题

第4题

第5题

第6题

第7题

相关内容