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| Section | Weight | Objectives |
|---|---|---|
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage - Arithmetic operations and NULL handling |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Manipulating Data and Managing Transactions | - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements | |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Restricting and Sorting Data | 15% | - Operator precedence - Substitution variables, DEFINE and VERIFY commands - ORDER BY clause and sorting rules - WHERE clause and filtering conditions |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Conversion Functions and Conditional Expressions | 10% | - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions - Implicit and explicit data type conversion |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Managing Tables and Constraints | - Data types, creating/altering/dropping tables - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use sequences - Create and use synonyms | |
| Displaying Data from Multiple Tables | 15% | - Self-joins and outer joins - Cartesian products - Equijoins and non-equijoins |
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NEW QUESTION # 171
Which two statements are true about substitution variables?
Answer: C,F
Explanation:
Substitution variables in Oracle are used to replace a value dynamically during the execution of SQL statements. The behavior of these variables is well-documented:
* C. A substitution variable prefixed with & always prompts only once for a value in a session: This is true. In a session, when you use a single ampersand (&), SQL*Plus or SQL Developer will prompt for the value the first time the variable is encountered. The value for this variable will then be reused for the remainder of the session unless it is redefined.
* D. A substitution variable can be used with any clause in a SELECT statement: Substitution variables can be placed in any part of a SQL statement, including the SELECT, WHERE, GROUP BY, ORDER BY, etc. They are not limited to any specific clause.
References:
* Oracle SQL*Plus User's Guide and Reference, which discusses substitution variables.
NEW QUESTION # 172
Which statements is true about using functions in WHERE and HAVING?
Answer: D
Explanation:
Single-row functions can be used in the WHERE and HAVING clauses without requiring a subquery.
However, aggregate functions, which operate on many rows to give one result per group, cannot be used in a WHERE clause unless a subquery is used because the WHERE clause is processed before the individual rows are aggregated into groups.
A). False. Single-row functions can be directly used in the WHERE clause.
B). False. Single-row functions can be directly used in the HAVING clause.
C). True. Aggregate functions cannot be used in the WHERE clause without a subquery because the WHERE clause filters individual rows before they are aggregated.
D). False. Aggregate functions are intended to be used in the HAVING clause, which is specifically for filtering groups of rows after they have been aggregated, and they do not require a subquery to be used there.
NEW QUESTION # 173
Examine this list of queries:
Which two statements are true?
Answer: D,E
NEW QUESTION # 174
Which three privileges can be restricted to a subset of columns in a table?
Answer: A,D,F
Explanation:
B: True. The REFERENCES privilege can be granted on specific columns within a table. This is necessary when a user needs to define foreign key constraints that reference those particular columns.
C: True. The UPDATE privilege can be granted on specific columns, allowing users to update only designated columns within a table. This is useful for restricting write access to sensitive or critical data within a table.
F: True. The INSERT privilege can also be granted on specific columns, meaning a user can be permitted to insert data into only certain columns of a table. This helps in maintaining data integrity and controlling access to data fields based on user roles.
NEW QUESTION # 175
Evaluate the following SELECT statement and view the exhibit to examine its output:
SELECT constraint_name, constraint_type, search_condition, r_constraint_name, delete_rule, status, FROM user_constraints WHERE table_name = 'ORDERS'; CONSTRAINT_NAME CON SEARCH_CONDITION R_CONSTRAINT_NAME DELETE_RULE STATUS
ORDER_DATE_NN
C
"ORDER_DATE" IS NOT NULL
ENABLED
ORDER_CUSTOMER_ID_NN
C
"CUSTOMER_ID" IS NOT NULL
ENABLED
ORDER_MODE_LOV
C
order _mode in ('direct', 'online')
ENABLED
ORDER TOTAL MIN
C
order total >= 0
ENABLED
ORDER PK
P
ENABLED
ORDERS CUSTOMER ID
R
CUSTOMERS ID
SET NULL
ENABLED
ORDERS SALES REP
R
EMP EMP ID
SET NULL
ENABLED
Which two statements are true about the output? (Choose two.)
Answer: B,C
NEW QUESTION # 176
......
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