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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Topic 2: Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling |
| Topic 3: Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - ORDER BY clause and sorting rules - Operator precedence |
| Topic 4: Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Topic 5: Using Data Dictionary Views | - Retrieve metadata and object information | |
| Topic 6: Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use synonyms - Create and use sequences | |
| Topic 7: Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts - Transaction control: COMMIT, ROLLBACK, SAVEPOINT | |
| Topic 8: Relational Database Concepts | 10% | - ERD and SQL statement mapping - Relationship between database and SQL - Theoretical and physical aspects of relational databases |
| Topic 9: Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Cartesian products - Self-joins and outer joins |
| Topic 10: Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Topic 11: Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - NVL, NULLIF, COALESCE and CASE expressions - TO_CHAR, TO_NUMBER, TO_DATE functions |
| Topic 12: Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Topic 13: Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Topic 14: Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Topic 15: Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
| Topic 16: Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
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NEW QUESTION # 298
Which two join conditions in a from clause are non-equijoins?
Answer: B,E
Explanation:
Equijoins are joins that use the equality operator (=) to match rows. Non-equijoins are joins that use operators other than the equality operator.
A . False. This condition is an equijoin as it uses the equality operator (=).
B . True. This join condition uses the BETWEEN operator, which is not based on equality.
C . False. A natural join is a type of equijoin where the join is made on all columns with the same names in both tables.
D . False. USING clause is used to specify an equijoin on one or more columns.
E . True. This join condition uses the greater than or equal to (>=) operator, making it a non-equijoin.
Reference:
Oracle Documentation on Joins: https://docs.oracle.com/database/121/SQLRF/queries006.htm#SQLRF52358
NEW QUESTION # 299
View the Exhibit and examine the data in the PRODUCTS table.
You must display product names from the PRODUCTS table that belong to the 'Software/other' category with minimum prices as either $2000 or $4000 and with no unit of measure.
You issue this query:
Which statement is true?
Answer: C
NEW QUESTION # 300
View the Exhibit and examine the structure of the PORDUCT_INFORMATION table. (Choose the best answer.)
PRODUCT_ID column is the primary key.
You create an index using this command:
SQL > CREATE INDEX upper_name_idx
ON product_information(UPPER(product_name));
No other indexes exist on the PRODUCT_INFORMATION table.
Which query would use the UPPER_NAME_IDX index?
Answer: B
NEW QUESTION # 301
View the exhibit and examine the structure of the PROMOTIONS table.
You have to generate a report that displays the promo name and start date for all promos that started after the last promo in the 'INTERNET' category.
Which query would give you the required output?
Answer: A
NEW QUESTION # 302
Examine the structure of the MARKS table:
Which two statements would execute successfully? (Choose two.)
Answer: B,D
NEW QUESTION # 303
......
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