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| Section | Weight | Objectives |
|---|---|---|
| Working with Time Zones and Date/Time Data | - TIMESTAMP, INTERVAL data types - Time zone conversion functions | |
| Using Subqueries to Solve Queries | - Correlated subqueries for update/delete - Single-row and multi-row subqueries | |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Relational Database Concepts | 10% | - Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases |
| Managing Views | - Create, modify and drop views - Updatable and read-only views | |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
| Conversion Functions and Conditional Expressions | 10% | - Implicit and explicit data type conversion - TO_CHAR, TO_NUMBER, TO_DATE functions - NVL, NULLIF, COALESCE and CASE expressions |
| Managing Tables and Constraints | - Temporary and external tables - Data types, creating/altering/dropping tables - Constraints: primary key, foreign key, unique, check, not null | |
| Restricting and Sorting Data | 15% | - Operator precedence - Substitution variables, DEFINE and VERIFY commands - WHERE clause and filtering conditions - ORDER BY clause and sorting rules |
| Using SET Operators | - Ordering results with set operations - UNION, UNION ALL, INTERSECT, MINUS operators | |
| Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts - INSERT, UPDATE, DELETE, MERGE statements | |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Aggregating Data Using Group Functions | 10% | - GROUP BY and HAVING clauses - SUM, AVG, COUNT, MAX, MIN functions - Handling NULLs in group functions |
| 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 |
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NEW QUESTION # 134
View the Exhibit and examine the data in the PRODUCT_INFORMATIONtable.
Which two tasks would require subqueries? (Choose two.)
Answer: A,C
NEW QUESTION # 135
Which three actions can you perform by using the ALTER TABLE command?
Answer: E,F
Explanation:
The actions possible using the ALTER TABLE command:
* E. Rename a table: The ALTER TABLE command can be used to rename a table, although the syntax typically involves RENAME TO as part of table management.
* F. Enable or disable constraints on a table: This is a standard use of the ALTER TABLE command, allowing for constraints to be enabled or disabled, which is critical for managing table integrity during data loads or maintenance.
Incorrect options:
* A: You cannot drop pseudo columns from a table as they are not explicitly defined or managed like regular columns.
* B: The ALTER TABLE command does not directly restrict DML statements; this would typically be managed through security roles or other database mechanisms.
* C: Dropping all columns from a table simultaneously is not possible; a table must retain at least one column.
* D: Locking a set of rows is performed with SQL commands like SELECT FOR UPDATE, not with ALTER TABLE.
NEW QUESTION # 136
Examine the data in the CUST_NAME column of the CUSTOMERS table:
CUST_NAME
---------------------
Renske Ladwig
Jason Mallin
Samuel McCain
Allan MCEwen
Irene Mikkilineni
Julia Nayer
You want to display the CUST_NAME values where the last name starts with Mc or MC.
Which two WHERE clauses give the required result?
Answer: A,D
Explanation:
To find customer names where the last name starts with Mc or MC, the correct queries are:
* A. WHERE UPPER(SUBSTR(cust_name, INSTR(cust_name, ' ') + 1)) LIKE 'MC%'This query
* converts the substring of cust_name that comes after the first space (which should correspond to the last name) to uppercase and checks if it starts with 'MC', which will match both 'Mc' and 'MC'.
* E. WHERE SUBSTR(cust_name, INSTR(cust_name, ' ') + 1) LIKE 'Mc%'This query checks if the substring of cust_name after the first space starts with 'Mc'. However, this query will only match last names that start with 'Mc' and not 'MC' unless the database is using a case-insensitive collation.
Options B, C, and D are incorrect:
* B is incorrect because the syntax is not valid in Oracle SQL; the LIKE clause cannot be used to match multiple patterns in that way.
* C is incorrect because INITCAP would not only capitalize the first letter of 'mc' or 'Mc' but would lowercase all other letters, which is not the intended action.
* D is incorrect because, like option C, INITCAP is not the appropriate function for this use case and it will not correctly identify names that start with 'MC'.
NEW QUESTION # 137
View the Exhibit and examine the structure of the ORDER_ITEMS table.
You must select the ORDER_ID of the order that has the highest total value among all the orders in the ORDER_ITEMS table.
Which query would produce the desired result?
Answer: C
NEW QUESTION # 138
Examine the description of the EMPLOYEES table:
Examine this query:
Which line produces an error?
Answer: A
Explanation:
In the provided SQL query, the issue arises from the alias 'a.avg_sal' which is defined in the subquery but is being referenced in the SELECT list of the outer query. This is not permitted in SQL as the scope of the alias defined in the subquery is only within that subquery.
Here is the breakdown of the code and the error:
* Line 1: Correct syntax for initiating a SELECT statement.
* Line 2: Refers to 'e.salary', which is a correct reference to the 'salary' column using alias 'e' for the employees table.
* Line 3: 'a.avg_sal' attempts to reference an alias that is defined in the subquery within the outer query, which is not allowed. This is because 'avg_sal' is defined in the subquery's SELECT list and cannot be referenced outside of it. The correct way to include the average salary from the subquery in the SELECT list of the main query would be to repeat the subquery or to use a join that includes the average salary.
* Line 5-7: The subquery itself is correctly formed; it computes the average salary for the same department.
* Line 8: The ORDER BY clause is properly referencing 'e.last_name', which is defined in the outer query.
Therefore, the error occurs at Line 3 where 'a.avg_sal' is not a valid reference in the SELECT list of the main query because it is defined in the subquery.
The rules of scope for aliases in subqueries are specified in the Oracle Database SQL Language Reference 12c documentation. Subquery aliases cannot be referenced outside their subquery.
NEW QUESTION # 139
......
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