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| Section | Weight | Objectives |
|---|---|---|
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Aggregating Data Using Group Functions | 10% | - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions |
| Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - Operator precedence - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements | |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Conversion Functions and Conditional Expressions | 10% | - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions |
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NEW QUESTION # 347
View the Exhibit and examine the structure of CUSTOMERStable.
Evaluate the following query:
Which statement is true regarding the above query?
Answer: D
NEW QUESTION # 348
An Oracle database server session has an uncommitted transaction in progress which updated 5000 rows in a table.
In which three situations does the transaction complete thereby committing the updates?
Answer: A,C,D
NEW QUESTION # 349
Which three are key components of an Entity Relationship Model?
Answer: B,E,F
Explanation:
Key components of an Entity-Relationship Model (ERM) include:
* B. an attribute: Attributes are properties or characteristics of an entity, such as a person's name, date of birth, etc., and are essential in describing the data aspects of an entity in an ER model.
* E. a relationship: Relationships describe how entities interact with each other within the database structure, such as a customer placing an order.
* F. an entity: Entities are the key components of an ER model, representing objects or things within the domain that have a distinct existence, like 'Customer' or 'Order'.
Incorrect options:
* A: A table is a database structure used to implement an entity in relational databases, not a component of the ER model itself.
* C: While unique identifiers are crucial in database implementation (typically as primary keys), they are a specific attribute type, not a general component of ER models.
* D: An activity is not a component of an ER model; activities relate more to process models or behavioral models in systems design.
NEW QUESTION # 350
Evaluate the following two queries:
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit IN (1000, 2000, 3000);
SQL> SELECT cust_last_name, cust_city
FROM customers
WHERE cust_credit_limit = 1000 or cust_credit_limit = 2000 or
cust_credit_limit = 3000
Which statement is true regarding the above two queries?
Answer: C
Explanation:
Explanation
References:
http://oraclexpert.com/restricting-and-sorting-data/
NEW QUESTION # 351
Which statement is true regarding external tables?
Answer: C
Explanation:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables013.htm
NEW QUESTION # 352
......
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