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| Section | Objectives |
|---|---|
| Topic 1: SQL Functions | - Conversion and conditional functions
|
| Topic 2: SQL Retrieval | - Joins and set operations
|
| Topic 3: Subqueries and Advanced SQL | - Correlated subqueries and nested queries - Single-row and multi-row subqueries |
| Topic 4: Relational Database Concepts | - Tables, rows, columns, and relational model basics - Data types and database objects overview |
| Topic 5: Data Manipulation and Schema Objects | - DDL operations
|
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NEW QUESTION # 269
View the Exhibit and examine the structure in the DEPARTMENTS tables. (Choose two.)
Examine this SQL statement:
SELECT department_id "DEPT_ID", department_name, 'b'
FROM departments
WHERE departments_id=90
UNION
SELECT department_id, department_name DEPT_NAME, 'a'
FROM departments
WHERE department_id=10
Which two ORDER BY clauses can be used to sort the output? (Choose two.)
Answer: A,B
NEW QUESTION # 270
Evaluate the following statement.
Which statement is true regarding the evaluation of rows returned by the subquery in the INSERT statement?
Answer: B
NEW QUESTION # 271
You and your colleague Andrew have these privileges on the EMPLOYEE_RECORDS table:
1. SELECT
2. INSERT
3. UPDATE
4. DELETE
You connect to the database instance an perform an update to some of the rows in EMPLOYEE_RECORDS, but don't commit yet.
Andrew connects to the database instance and queries the table
No othet user are accessing the table
Which two statements ate true at this point?
Answer: B,D
NEW QUESTION # 272
Which two are true about external tables that use the ORACLE _DATAPUMP access driver?
Answer: E
Explanation:
External tables using the ORACLE_DATAPUMP access driver have specific characteristics:
C). Creating an external table using the ORACLE_DATAPUMP access driver allows you to select data from other tables, including another external table or a regular table whose rows are stored in database blocks.
A, B, D, and E are incorrect. Specifically:
* A is incorrect because creating an external table does not automatically create a directory object; the
* directory object must exist prior to or be created separately.
* B is incorrect as it limits the creation to tables stored in database blocks, which is not a restriction.
* D is incorrect because creating an external table does not create a dump file; it reads from an existing dump file created by Data Pump.
* E is also incorrect because the dump file is not created as part of the external table creation process.
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "CREATE TABLE" for External Tables
NEW QUESTION # 273
Examine this partial command:
Which two clauses are required for this command to execute successfully?
Answer: B,D
Explanation:
In Oracle Database 12c, when creating an external table using the CREATE TABLE ... ORGANIZATION EXTERNAL statement, there are certain clauses that are mandatory for the command to execute successfully.
* Statement C, the LOCATION clause, is required. The LOCATION clause specifies one or more external data source locations, typically a file or a directory that the external table will read from.
Without this, Oracle would not know where to find the external data for the table.
* Statement E, the access driver TYPE clause, is also required. The access driver tells Oracle how to interpret the format of the data files. The most common access driver is ORACLE_LOADER, which allows the reading of data files in a format compatible with the SQL*Loader utility. Another option could be ORACLE_DATAPUMP, which reads data in a Data Pump format.
* Statements A, B, and D are not strictly required for the command to execute successfully, although they are often used in practice:
* A, the DEFAULT DIRECTORY clause, is not mandatory if you have specified the full path in the LOCATION clause, but it is a best practice to use it to avoid hard-coding directory paths in the LOCATION clause.
* B, the REJECT LIMIT clause, is optional and specifies the maximum number of errors to allow during the loading of data. If not specified, the default is 0, meaning the load will fail upon the first error encountered.
* D, the ACCESS PARAMETERS clause, is where one would specify parameters for the access driver, such as field delimiters and record formatting details. While it is common to include this clause to define the format of the external data, it is not absolutely required for the command to execute; defaults would be used if this clause is omitted.
For reference, you can find more details in the Oracle Database SQL Language Reference for version 12c, under the CREATE TABLE statement for external tables.
NEW QUESTION # 274
......
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