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| Section | Weight | Objectives |
|---|---|---|
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
| Displaying Data from Multiple Tables | 15% | - Cartesian products - Self-joins and outer joins - Equijoins and non-equijoins |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules - WHERE clause and filtering conditions |
| Conversion Functions and Conditional Expressions | 10% | - TO_CHAR, TO_NUMBER, TO_DATE functions - Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables - Temporary and external tables | |
| Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements |
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NEW QUESTION # 382
View the Exhibit and examine the structure of the CUSTOMERS table.
Using the CUSTOMERS table, you must generate a report that displays a credit limit increase of 15% for all customers.
Customers with no credit limit should have "Not Available" displayed.
Which SQL statement would produce the required result?
Answer: C
NEW QUESTION # 383
Examine the description of the PRODUCT_ STATUS table:
The STATUS column contains the values IN STOCK or OUT OF STocK for each row.
Which two queries will execute successfully?
Answer: D
Explanation:
The || operator is used in Oracle SQL to concatenate strings, and the q quote operator allows you to use alternative quoting mechanisms to avoid conflicts with single quotes within a string.
In options A, B, C, D, E, and F, the q-quote operator is used in different ways to define string literals.
The correct use of the q quote operator requires the format q'[...]', where [...] is the quote delimiter of your choice and can be any single character such as {, [, (, <, or others.
Option D is the correct answer because it follows the correct syntax for the q quote operator and concatenates the literal string correctly with the value of PROD_ID.
Here is the corrected syntax from option D:
SELECT PROD_ID || q'[('s not available)]' "CURRENT AVAILABILITY" FROM product_status WHERE status = 'OUT OF STOCK'; This query will execute successfully and is the only one that correctly uses the q quote operator.
NEW QUESTION # 384
Examine the data in the ORDERS table:
Examine the data in the INVOICES table:
Examine this query:
SELECT order_ id, order_ date FROM orders
INTERSECT
SELECT order_ 1d, order_ date FROM invoices;
Which two rows will it return?
Answer: A,B
NEW QUESTION # 385
Which two statements are true about a full outer join?
Answer: B,E
NEW QUESTION # 386
Examine the structure of the members table:
Which query can be used to display the last names and city names only for members from the states MO and MI?
Answer: B
NEW QUESTION # 387
......
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