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| Section | Weight | Objectives |
|---|---|---|
| Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts | |
| Managing Tables and Constraints | - Temporary and external tables - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Displaying Data from Multiple Tables | 15% | - Cartesian products - Self-joins and outer joins - Equijoins and non-equijoins |
| Managing Indexes, Synonyms and Sequences | - Create and maintain indexes - Create and use sequences - Create and use synonyms | |
| Controlling User Access | - Roles, granting and revoking privileges - System and object privileges | |
| 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 |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions - GROUP BY and HAVING clauses |
| Using Single-Row Functions to Customize Output | 20% | - Nested functions usage - Character, number, and date functions |
| Retrieving Data Using SQL SELECT Statement | 20% | - SELECT statement syntax and usage - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - Operator precedence - ORDER BY clause and sorting rules |
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NEW QUESTION # 151
Examine the description of the CUSTOMERS table:
Which three statements will do an implicit conversion?
Answer: B,D,E
Explanation:
A: No implicit conversion is done here because TO_CHAR is an explicit conversion from a numeric to a string data type.
B: Implicit conversion happens here because the '0001' string will be automatically converted to a numeric data type to match the CUSTOMER_ID field.
C: No implicit conversion is needed because 0001 is already a numeric literal.
D: Implicit conversion occurs here because the string '01-JAN-19' will be converted to a date type to compare with INSERT_DATE.
E: No implicit conversion; DATE is explicitly specified using the DATE keyword.
F: Incorrect syntax, it has typographical errors and also TO_DATE is an explicit function, not an implicit conversion.
Reference for SQL functions, conversions, and the CROSS JOIN behavior can be found in the Oracle Database SQL Language Reference 12c documentation.
NEW QUESTION # 152
Which two tasks can be performed by using Oracle SQL statements?
Answer: C,E
Explanation:
References:
http://www.techonthenet.com/oracle/password.php
https://docs.oracle.com/cd/B28359_01/server.111/b28324/tdpii_distdbs.htm
NEW QUESTION # 153
Which two statements are true about Oracle databases and SQL?
Answer: A,B
NEW QUESTION # 154
View the Exhibit and examine PRODUCTS and ORDER_ITEMS tables.
You executed the following query to display PRODUCT_NAME and the number of times the product has been ordered:
SQL>SELECT p.product_name, i.item_cnt
FROM (SELECT product_id, COUNT (*) item_cnt
FROM order_items
GROUP BY product_id) i RIGHT OUTER JOIN products p
ON i.product_id = p.product_id;
What would happen when the above statement is executed?
Answer: B
NEW QUESTION # 155
Which two statements are true regarding roles? (Choose two.)
Answer: C,D
Explanation:
Explanation
http://docs.oracle.com/cd/E25054_01/network.1111/e16543/authorization.htm#autoId28
NEW QUESTION # 156
......
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