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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Reporting Aggregated Data Using Group Functions | 15% | - Identify the available group functions - Include or exclude grouped rows by using the HAVING clause - Describe the use of group functions - Group data by using the GROUP BY clause |
| Topic 2: Controlling User Access | 5% | - Grant privileges on tables and on a view - Differentiate system privileges from object privileges - Distinguish between granting privileges and roles |
| Topic 3: Displaying Data from Multiple Tables Using Joins | 15% | - Write SELECT statements to access data from more than one table using equijoins and non-equijoins - Cross join tables - Join a table to itself by using a self-join - View data that does not meet a join condition by using outer joins |
| Topic 4: Working with Oracle Database SQL | 8% | - Explain the installation of Oracle Database software - Start up and shut down a database - Create a container database - Describe the Oracle Database architecture |
| Topic 5: Restricting and Sorting Data | 6% | - Limit the rows that are retrieved by a query - Use DEFINE and UNDEFINE commands - Sort the rows that are retrieved by a query - Use ampersand substitution to restrict and sort output at runtime |
| Topic 6: Using Subqueries to Solve Queries | 15% | - Describe the types of problems that subqueries can solve - Write single-row and multi-row subqueries - Define subqueries - List the types of subqueries |
| Topic 7: Retrieving Data Using the SQL SELECT Statement | 5% | - List the capabilities of SQL SELECT statements - Differentiate between SQL statements and SQL*Plus commands - Execute a basic SELECT statement |
| Topic 8: Using Set Operators | 5% | - Use a set operator to combine multiple queries into a single query - Describe set operators - Describe the order of precedence when the set operators are used |
| Topic 9: Using Conversion Functions and Conditional Expressions | 10% | - 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 - Use conditional IF THEN ELSE logic in a SELECT statement |
| Topic 10: Using DDL Statements to Create and Manage Tables | 14% | - Review the table structure - Categorize the main database objects - Drop, rename, and truncate tables - Create a simple table - Describe the data types that are available for columns - Alter table definitions |
| Topic 11: Using Single-Row Functions to Customize Output | 10% | - Manipulate numbers with the ROUND, TRUNC, and MOD functions - Describe the differences between single-row and multiple-row functions - Manipulate strings with character function in the SELECT and WHERE clauses - Perform arithmetic with date data - Manipulate dates with the date functions |
| Topic 12: Manipulating Data | 14% | - Update rows in a table - Control transactions - Delete rows from a table - Describe each data manipulation language (DML) statement - Insert rows into a table |
| Topic 13: Creating Other Schema Objects | 10% | - Create, modify, and retrieve data from a view - Create and maintain indexes - Create, maintain, and use sequences - Create synonyms for database objects |
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NEW QUESTION # 410
Which two join conditions in a from clause are non-equijoins?
Answer: C,D
Explanation:
Equijoins are joins that use the equality operator (=) to match rows. Non-equijoins are joins that use operators other than the equality operator.
A). False. This condition is an equijoin as it uses the equality operator (=).
B). True. This join condition uses the BETWEEN operator, which is not based on equality.
C). False. A natural join is a type of equijoin where the join is made on all columns with the same names in both tables.
D). False. USING clause is used to specify an equijoin on one or more columns.
E). True. This join condition uses the greater than or equal to (>=) operator, making it a non-equijoin.
NEW QUESTION # 411
Which two statements are true about dropping views? (Choose two.)
Answer: C,D
Explanation:
The view must be in your own schema or you must have the DROP ANY VIEW system privilege.
Specify CASCADE CONSTRAINTS to drop all referential integrity constraints that refer to primary and unique keys in the view to be dropped.
Reference: https://docs.oracle.com/cd/B12037_01/server.101/b10759/statements_9009.htm
NEW QUESTION # 412
Which three statements are true regarding the WHERE and HAVING clauses in a SQL statement? (Choose three.)
Answer: A,B,E
NEW QUESTION # 413
Which two are true about constraints?
Answer: A,D
Explanation:
A; False. Constraints are enforced during INSERT and UPDATE operations, and by the nature of their definition, they impact DELETE operations as well (in the case of referential constraints).
B: False. A column with a foreign key constraint can contain a NULL value unless it is also constrained to be NOT NULL.
C: False. Not all constraints can be defined at the column level. For example, some constraints such as FOREIGN KEY constraints are more commonly defined at the table level.
D: True. A constraint can be disabled regardless of whether the constrained column contains data. However, re-enabling the constraint requires that all data satisfy the constraint rules.
E; True. A column with a UNIQUE constraint can indeed contain a NULL value, as NULL is considered not equal to any value, including itself. This means that multiple rows with NULL values do not violate the UNIQUE constraint.
References:
* Oracle Documentation on Constraints:
https://docs.oracle.com/database/121/SQLRF/clauses002.htm#SQLRF52271
* Oracle Documentation on Enabling and Disabling Constraints:
https://docs.oracle.com/database/121/ADMIN/clustrct.htm#ADMIN13508
NEW QUESTION # 414
In the EMPLOYEEStable there are 1000 rows and employees are working in the company for more than 10 years.
Evaluate the following SQL statement:
What would be the result?
Answer: A
NEW QUESTION # 415
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