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| Section | Weight | Objectives |
|---|---|---|
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Managing Tables and Constraints | - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables | |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Restricting and Sorting Data | 15% | - WHERE clause and filtering conditions - Operator precedence - ORDER BY clause and sorting rules - Substitution variables, DEFINE and VERIFY commands |
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Cartesian products - Self-joins and outer joins |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling - SELECT statement syntax and usage |
| 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 |
| Managing Indexes, Synonyms and Sequences | - Create and use sequences - Create and use synonyms - Create and maintain indexes | |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete |
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NEW QUESTION # 20
You own table DEPARTMENTS, referenced by views, indexes, and synonyms.
Examine this command which executes successfully:
DROP TABLE departments PURGE;
Which three statements are true?
Answer: A,B,E
NEW QUESTION # 21
Which two are SQL features?
Answer: A,E
Explanation:
SQL (Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system.
A . False. SQL does not have graphical capabilities; it is a textual language for database interaction.
B . False. SQL supports variable definition, but it is not a core feature of the language. Variables are more commonly defined in procedural extensions to SQL, such as PL/SQL in Oracle.
C . True. SQL provides database transaction control through statements like COMMIT, ROLLBACK, and SAVEPOINT.
D . True. SQL is designed for processing sets of data, allowing for operations such as selection, projection, and joins on sets of rows.
E . False. SQL does not provide capabilities to update data in external files. It operates on data within the database.
Reference:
Oracle Documentation on SQL Language: https://docs.oracle.com/database/121/SQLRF/toc.htm
NEW QUESTION # 22
Sales data of a company is stored in two tables, SALES1 and SALES2, with some data being duplicated across the tables. You want to display the results from the SALES1 table, which are not present in the SALES2 table.
Which set operator generates the required output?
Answer: B
Explanation:
References:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/queries004.htm
NEW QUESTION # 23
Examine the description of the TRANSACTIONS table:
Which two SQL statements execute successfully? (Choose two.)
Answer: B,D
NEW QUESTION # 24
Examine the structure proposed for the TRANSACTIONS table:
Which two statements are true regarding the storage of data in the above table structure? (Choose two.)
Answer: C,D
NEW QUESTION # 25
......
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