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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Operator precedence - Substitution variables, DEFINE and VERIFY commands |
| Topic 2: Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Topic 3: Managing Tables and Constraints | - Data types, creating/altering/dropping tables - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null | |
| Topic 4: Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions |
| Topic 5: Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Topic 6: Relational Database Concepts | 10% | - Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases |
| Topic 7: Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use synonyms - Create and use sequences | |
| Topic 8: Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Cartesian products - Self-joins and outer joins |
| Topic 9: Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions |
| Topic 10: Manipulating Data and Managing Transactions | - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements | |
| Topic 11: Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Topic 12: Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Topic 13: Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Topic 14: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 15: Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
| Topic 16: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions |
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NEW QUESTION # 270
Evaluate these commands which execute successfully:
Which two statements are true about the ORD_ITEMS table and the ORD_SEQ sequence?
(Choose two.)
Answer: C,E
NEW QUESTION # 271
Examine the description of the transactions table:
Which two SQL statements execute successfully?
Answer: C,E
Explanation:
A). True, this statement will execute successfully. In Oracle SQL, column aliases can be given in double quotes which allows the use of special characters like a hyphen. Additionally, you can perform arithmetic operations such as amount+100 directly in the SELECT clause to return increased values of amount.
C). True, this statement is also valid. It does not use any special characters or reserved keywords as aliases that would require double quotes. The arithmetic operation is the same as in option A, which is permissible.
For B, D, and E, the reasons for failure are: B. In Oracle SQL, single quotes are used for string literals, not for column aliases. Therefore, using single quotes around 'CUSTOMER-ID' and 'DUES' will result in an error. D.
The word "DATE" is a reserved keyword in Oracle SQL. When used as a column alias without double quotes, it will lead to an error. In this statement, although "DATE" is in double quotes, it's a best practice to avoid using reserved keywords as aliases.
E). There are syntax errors in the statement. "customer id" should be "customer_id", and the alias "CUSTOMER-ID" should be enclosed in double quotes if special characters are used. Also, "DUES AMOUNT" as an alias should be in double quotes to be valid because it contains a space.
References:
* Oracle documentation on column aliases: Oracle Database SQL Language Reference
* Oracle reserved words: Oracle Database SQL Language Reserved Words
NEW QUESTION # 272
Which statements are true regarding primary and foreign key constraints and the effect they can have on table data?
Answer: E,F,G
Explanation:
Regarding primary and foreign key constraints:
* A. A table can have only one primary key but multiple foreign keys. This is true. A table is constrained to have only one primary key, which can consist of multiple columns, but can have several foreign keys referencing primary keys in other tables.
* C. Primary key and foreign key constraints can be defined at both the column and table level.
True. Constraints can be defined inline with the column definition or separately at the end of the table definition.
* E. It is possible for child rows that have a foreign key to be deleted automatically from the child table at the time the parent row is deleted. This is also true if the foreign key is defined with the ON DELETE CASCADE option.
Options B, D, F, and G are incorrect:
* B is incorrect because if a parent row is deleted, the child rows cannot remain without violating the integrity unless the foreign key is defined with ON DELETE SET NULL or similar behavior.
* D is incorrect because both primary and foreign key constraints can be defined at both levels.
* F is incorrect as the names of the foreign key columns do not need to match the primary key column names.
* G is incorrect as a table can have multiple foreign keys.
NEW QUESTION # 273
View the exhibit and examine the description of the PRODUCT_INFORMATION table.
Which SQL statement would retrieve from the table the number of products having LIST_PRICE as NULL?
Answer: C
NEW QUESTION # 274
Which two statements are true about a self join? (Choose two.)
Answer: A,D
Explanation:
Explanation/Reference: https://www.oracletutorial.com/oracle-basics/oracle-self-join/
NEW QUESTION # 275
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