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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using Conversion Functions and Conditional Expressions | 10% | - Use conditional IF THEN ELSE logic in a SELECT statement - Describe implicit and explicit data type conversion - Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions - Apply the NVL, NULLIF, and COALESCE functions to data |
| Topic 2: Using Single-Row Functions to Customize Output | 10% | - Manipulate dates with the date functions - Describe the differences between single-row and multiple-row functions - Manipulate strings with character function in the SELECT and WHERE clauses - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Perform arithmetic with date data |
| Topic 3: Using Subqueries to Solve Queries | 15% | - Write single-row and multi-row subqueries - List the types of subqueries - Define subqueries - Describe the types of problems that subqueries can solve |
| Topic 4: 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 |
| Topic 5: Retrieving Data Using the SQL SELECT Statement | 5% | - Execute a basic SELECT statement - Differentiate between SQL statements and SQL*Plus commands - List the capabilities of SQL SELECT statements |
| Topic 6: Using DDL Statements to Create and Manage Tables | 14% | - Alter table definitions - Create a simple table - Categorize the main database objects - Review the table structure - Drop, rename, and truncate tables - Describe the data types that are available for columns |
| Topic 7: Manipulating Data | 14% | - Update rows in a table - Delete rows from a table - Insert rows into a table - Describe each data manipulation language (DML) statement - Control transactions |
| Topic 8: Reporting Aggregated Data Using Group Functions | 15% | - Group data by using the GROUP BY clause - Describe the use of group functions - Include or exclude grouped rows by using the HAVING clause - Identify the available group functions |
| Topic 9: Working with Oracle Database SQL | 8% | - Create a container database - Describe the Oracle Database architecture - Explain the installation of Oracle Database software - Start up and shut down a database |
| Topic 10: Displaying Data from Multiple Tables Using Joins | 15% | - Join a table to itself by using a self-join - Cross join tables - View data that does not meet a join condition by using outer joins - Write SELECT statements to access data from more than one table using equijoins and non-equijoins |
| Topic 11: Creating Other Schema Objects | 10% | - Create synonyms for database objects - Create, maintain, and use sequences - Create and maintain indexes - Create, modify, and retrieve data from a view |
| Topic 12: Controlling User Access | 5% | - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles - Grant privileges on tables and on a view |
| Topic 13: Restricting and Sorting Data | 6% | - Sort the rows that are retrieved by a query - Limit the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime - Use DEFINE and UNDEFINE commands |
>> 1z0-071 Question Explanations <<
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NEW QUESTION # 350
View the exhibit and examine the structure of the PROMOTIONS table.
You have to generate a report that displays the promo name and start date for all promos that started after the last promo in the 'INTERNET' category.
Which query would give you the required output?
Answer: C
NEW QUESTION # 351
Examine the data in the INVOICES table:
Examine the data in the CURRENCIES table:
CURRENCY_CODE
-------------
JPY
GPB
CAD
EUR
USD
Which query returns the currencies in CURRENCIES that are not present in INVOICES?
Answer: C
NEW QUESTION # 352
Examine the description of the BRICKS table;
Examine the description of the BRICKS_STAGE table;
Which two queries execute successfully?
Answer: C,D
NEW QUESTION # 353
You want to write a query that prompts for two column names and the WHEREcondition each time it is executed in a session but only prompts for the table name the first time it is executed.
The variables used in your query are never undefined in your session.
Which query can be used?
Answer: C
NEW QUESTION # 354
Examine the description of the BOOKS_TRANSACTIONS table:
Examine this partial SQL statement:
SELECT * FROM books_transactions
Which two WHERE conditions give the same result?
Answer: A,D
Explanation:
When writing SQL statements with multiple conditions in the WHERE clause, it's important to understand how logical operators like AND and OR work. These operators are used to filter records based on more than one condition:
* The AND operator displays a record if all the conditions separated by AND are TRUE.
* The OR operator displays a record if any of the conditions separated by OR is TRUE.
The precedence of these operators is also important: AND operations are always evaluated before OR operations unless parentheses are used to explicitly define the order of operations. Therefore, conditions enclosed in parentheses are evaluated first as per the standard SQL operator precedence.
Given this understanding, let's evaluate the options:
* Option A uses parentheses to group the borrowed_date and transaction_type conditions together, ensuring these are evaluated first before the OR operator. This means the query will return records that meet both of these conditions or records with member_id 'A101' or 'A102', regardless of other conditions.
* Option D does not use parentheses around the borrowed_date and transaction_type conditions but does use them to group the member_id conditions. Since the AND operator has higher precedence than the OR, this query will first evaluate the borrowed_date and transaction_type conditions, then evaluate the grouped member_id conditions. The outcome is records that have a borrowed_date of SYSDATE, a transaction_type of 'RM', and a member_id of either 'A101' or 'A102'.
The results of Options A and D are effectively the same, even though the use of parentheses is different. This is because in both cases, the evaluation of the borrowed_date and transaction_type conditions will be performed first due to their grouping by parentheses in Option A and the precedence of AND over OR in Option D. Therefore, they will both return all records where borrowed_date equals SYSDATE and transaction_type equals 'RM', plus any records where member_id is either 'A101' or 'A102'.
For further details on SQL operator precedence and logical operators, you can refer to Oracle Database SQL Language Reference 12c documentation, specifically the sections on conditional expressions.
NEW QUESTION # 355
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