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| Section | Weight | Objectives |
|---|---|---|
| Aggregating Data Using Group Functions | 10% | - Handling NULLs in group functions - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Managing Indexes, Synonyms and Sequences | - Create and use sequences - Create and maintain indexes - Create and use synonyms | |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
| Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Operator precedence - Substitution variables, DEFINE and VERIFY commands |
| 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 |
| Relational Database Concepts | 10% | - Relationship between database and SQL - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping |
| Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Managing Tables and Constraints | - Temporary and external tables - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null |
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NEW QUESTION # 418
Examine the description of the ENPLOYES table:
Which query requires explicit data type conversion?
Answer: C
Explanation:
A look at the queries and how Oracle Database handles data type conversion:
* A: This statement takes a substring of the JOIN_DATE column. Since JOIN_DATE is a DATE type and SUBSTR function expects a string, implicit conversion will occur from DATE to string based on the NLS_DATE_FORMAT setting. However, this will not require explicit conversion in the query itself.
* B: This statement tries to add '20' to JOIN_DATE. Oracle Database does not support adding a string to a DATE implicitly. An explicit conversion of '20' to a number is required, or using the INTERVAL keyword to add days or years as appropriate.
* C: This statement concatenates the date with an empty string and the salary. The database will implicitly convert the JOIN_DATE from a DATE to a string using the NLS_DATE_FORMAT setting and then perform the concatenation.
* D: This query attempts to compare a DATE column with a string literal '*10-02-2018'. An explicit conversion using TO_DATE is needed to convert the string to a DATE data type with the appropriate date format mask. In this case, because the string does not follow the NLS_DATE_FORMAT
'DD-MON-YY', it will not be implicitly converted correctly.
* E: This statement adds '120.50' to SALARY. Oracle Database will implicitly convert the string '120.50' to a number before performing the arithmetic addition, as SALARY is a NUMBER data type.
NEW QUESTION # 419
Which two statements about INVISIBLE indexes are true?
Answer: A,D
Explanation:
INVISIBLE indexes are a feature in Oracle Database 12c and later versions that allow an index to be maintained but not used by the optimizer unless explicitly hinted.
A . False. An INVISIBLE index still consumes storage space as it is maintained in the background.
B . False. There is no such restriction. You can create multiple INVISIBLE indexes on the same column list.
C . False. The optimizer can consider INVISIBLE indexes if they are hinted at in the query.
D . True. You can alter the visibility of an index using the ALTER INDEX command to make an INVISIBLE index VISIBLE.
E . True. Even though they are invisible to the optimizer by default, all DML operations such as INSERT, UPDATE, and DELETE continue to maintain the index as they would with a VISIBLE index.
Reference:
Oracle Documentation on Managing Indexes: https://docs.oracle.com/database/121/ADMIN/indexes.htm#ADMIN11741
NEW QUESTION # 420
Which two statements are true regarding savepoints? (Choose two.)
Answer: A,E
Explanation:
References:
NEW QUESTION # 421
Which two are true about the WITH GRANT OPTION clause?
Answer: A,C
NEW QUESTION # 422
Evaluate the following SQL commands:
The command to create a table fails. Identify the reason for the SQL statement failure.
Answer: C
NEW QUESTION # 423
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