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| Section | Weight | Objectives |
|---|---|---|
| Reporting Aggregated Data Using Group Functions | 15% | - Identify the available group functions - Group data by using the GROUP BY clause - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions |
| Using Set Operators | 5% | - Describe set operators - Describe the order of precedence when the set operators are used - Use a set operator to combine multiple queries into a single query |
| Restricting and Sorting Data | 6% | - Use DEFINE and UNDEFINE commands - Limit the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime - Sort the rows that are retrieved by a query |
| Using DDL Statements to Create and Manage Tables | 14% | - Alter table definitions - Describe the data types that are available for columns - Create a simple table - Categorize the main database objects - Review the table structure - Drop, rename, and truncate tables |
| Creating Other Schema Objects | 10% | - Create, modify, and retrieve data from a view - Create, maintain, and use sequences - Create synonyms for database objects - Create and maintain indexes |
| Controlling User Access | 5% | - Grant privileges on tables and on a view - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles |
| Using Subqueries to Solve Queries | 15% | - Define subqueries - Describe the types of problems that subqueries can solve - List the types of subqueries - Write single-row and multi-row subqueries |
| Manipulating Data | 14% | - Insert rows into a table - Delete rows from a table - Update rows in a table - Control transactions - Describe each data manipulation language (DML) statement |
| Working with Oracle Database SQL | 8% | - Describe the Oracle Database architecture - Explain the installation of Oracle Database software - Create a container database - Start up and shut down a database |
| Displaying Data from Multiple Tables Using Joins | 15% | - Join a table to itself by using a self-join - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - View data that does not meet a join condition by using outer joins - Cross join tables |
| Retrieving Data Using the SQL SELECT Statement | 5% | - List the capabilities of SQL SELECT statements - Execute a basic SELECT statement - Differentiate between SQL statements and SQL*Plus commands |
| Using Single-Row Functions to Customize Output | 10% | - Manipulate strings with character function in the SELECT and WHERE clauses - Describe the differences between single-row and multiple-row functions - Perform arithmetic with date data - Manipulate dates with the date functions - Manipulate numbers with the ROUND, TRUNC, and MOD functions |
| Using Conversion Functions and Conditional Expressions | 10% | - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Apply the NVL, NULLIF, and COALESCE functions to data - Use conditional IF THEN ELSE logic in a SELECT statement - Describe implicit and explicit data type conversion |
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NEW QUESTION # 323
Examine this query:
SELECT 2 FROM dual d1 CROSS JOIN dual d2 CROSS JOIN dual d3;
What is returned upon execution?
Answer: C
Explanation:
The given query is using the CROSS JOIN clause, which produces a Cartesian product of the tables involved.
The DUAL table in Oracle is a special one-row, one-column table present by default in all Oracle database installations. When you cross join the DUAL table with itself multiple times without any where clause to limit the rows, the result is a multiplication of the row count for each cross-joined instance.
Since DUAL has a single row, cross-joining it with itself any number of times will still result in a single row being returned. The SELECT 2 part of the query simply dictates that the number 2 will be the value in the column of this single row.
So, the result of this query will be one row with a single column containing the value 2.
References:
* Oracle Database SQL Language Reference 12c, especially sections on join operations and the DUAL table.
NEW QUESTION # 324
Which three statements are true about GLOBAL TEMPORARY TABLES?
Answer: A,C,E
NEW QUESTION # 325
View the Exhibit and examine the description for the SALES and CHANNELS tables. (Choose the best answer.)
You issued this SQL statement:
Which statement is true regarding the result?
Answer: B
NEW QUESTION # 326
Examine the description of the ORDERStable:
Examine the description of the INVOICEStable:
Which three statements execute successfully? (Choose three.)
Answer: D,E,F
NEW QUESTION # 327
View the exhibit and examine the structure of the CUSTOMERS table.
Which two tasks would require subqueries or joins to be executed in a single statement? (Choose two.)
Answer: A,B
NEW QUESTION # 328
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