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| Section | Weight | Objectives |
|---|---|---|
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Relational Database Concepts | 10% | - Theoretical and physical aspects of relational databases - ERD and SQL statement mapping - Relationship between database and SQL |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and use sequences - Create and maintain indexes | |
| Restricting and Sorting Data | 15% | - Substitution variables, DEFINE and VERIFY commands - Operator precedence - ORDER BY clause and sorting rules - WHERE clause and filtering conditions |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Temporary and external tables - Data types, creating/altering/dropping tables | |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Cartesian products - Self-joins and outer joins |
| 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 |
| Manipulating Data and Managing Transactions | - INSERT, UPDATE, DELETE, MERGE statements - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - Multi-table inserts | |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Arithmetic operations and NULL handling - Column aliases, concatenation, literals and DISTINCT - SELECT statement syntax and usage |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Aggregating Data Using Group Functions | 10% | - GROUP BY and HAVING clauses - Handling NULLs in group functions - SUM, AVG, COUNT, MAX, MIN functions |
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NEW QUESTION # 373
Examine the structure of the EMPLOYEES table.
You must display the maximum and minimum salaries of employees hired 1 year ago.
Which two statements would provide the correct output? (Choose two.)
Answer: B,C
NEW QUESTION # 374
Examine the description of the BRICKS table;
Examine the description of the BRICKS_STAGE table;
Which two queries execute successfully?
Answer: E
Explanation:
In Oracle SQL, when using the set operators like MINUS, the number of columns and their data types in the SELECT statements must match in sequence.
A). This query will not execute successfully because the SELECT * FROM bricks_stage will return all columns from the BRICKS_STAGE table, which are WEIGHT, SHAPE, and COLOR, but the first SELECT statement specifies only SHAPE and COLOR. The order and number of columns must match.
B). This query will not execute successfully. The SELECT statements have a different number of columns, and the data types of the columns in the same positions do not match between the two queries. The first column in the first SELECT is SHAPE (VARCHAR2), and in the second SELECT, it is WEIGHT (NUMBER).
C). This query will execute successfully. The SELECT * from both tables will ensure that the number of columns and their data types are the same, as SELECT * selects all columns from the table. As long as the two tables have the same column order and data types for those columns, the query will execute.
D). This query will not execute successfully. Even though the columns are of the same data types, their order in the SELECT statements must match for the set operator to work. The order of SHAPE and COLOR is switched between the two queries.
E). This query will not execute successfully. The number of columns in the SELECT statements is the same, but their data types do not match between the two queries. BRICK_ID (NUMBER) in the first query does not match WEIGHT (NUMBER) in the second, and SHAPE (VARCHAR2) does not match COLOR (VARCHAR2).
References:
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "Combining Queries with Set Operators"
* Oracle Database SQL Language Reference, 12c Release 1 (12.1): "MINUS"
NEW QUESTION # 375
View the Exhibit and examine the details of the PRODUCT_INFORMATION table.
Exhibit
You must display PRODUCT_NAME from the table where the CATEGORY_ID column has values 12 or 13, and the SUPPLIER_ID column has the value 102088.
You executed this SQL statement:
Which statement is true regarding the execution?
Answer: C
NEW QUESTION # 376
See the Exhibit and examine the structure of the PROMOTIONS table:
Using the PROMOTIONStable, you need to find out the average cost for all promos in the range $0-2000 and
$2000-5000 in category A.
You issue the following SQL statements:
What would be the outcome?
Answer: C
Explanation:
CASE Expression
Facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement:
CASE expr WHEN comparison_expr1 THEN return_expr1
[WHEN comparison_expr2 THEN return_expr2
WHEN comparison_exprn THEN return_exprn
ELSE else_expr]
END
NEW QUESTION # 377
Which three statements are true about sequences in a single instance Oracle database? (Choose three.)
Answer: A,B,C
Explanation:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6015.htm
NEW QUESTION # 378
......
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