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| Section | Weight | Objectives |
|---|---|---|
| Managing Views | - Updatable and read-only views - Create, modify and drop views | |
| Managing Tables and Constraints | - Constraints: primary key, foreign key, unique, check, not null - Data types, creating/altering/dropping tables - Temporary and external tables | |
| Using Subqueries to Solve Queries | - Single-row and multi-row subqueries - Correlated subqueries for update/delete | |
| Using Single-Row Functions to Customize Output | 20% | - Character, number, and date functions - Nested functions usage |
| Using SET Operators | - UNION, UNION ALL, INTERSECT, MINUS operators - Ordering results with set operations | |
| Relational Database Concepts | 10% | - Relationship between database and SQL - ERD and SQL statement mapping - Theoretical and physical aspects of relational databases |
| Using Data Dictionary Views | - Retrieve metadata and object information | |
| Retrieving Data Using SQL SELECT Statement | 20% | - Column aliases, concatenation, literals and DISTINCT - Arithmetic operations and NULL handling - SELECT statement syntax and usage |
| Displaying Data from Multiple Tables | 15% | - Equijoins and non-equijoins - Self-joins and outer joins - Cartesian products |
| Managing Indexes, Synonyms and Sequences | - Create and use synonyms - Create and maintain indexes - Create and use sequences | |
| Aggregating Data Using Group Functions | 10% | - SUM, AVG, COUNT, MAX, MIN functions - GROUP BY and HAVING clauses - Handling NULLs in group functions |
| Restricting and Sorting Data | 15% | - ORDER BY clause and sorting rules - WHERE clause and filtering conditions - Operator precedence - Substitution variables, DEFINE and VERIFY commands |
| 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 |
| Controlling User Access | - System and object privileges - Roles, granting and revoking privileges | |
| Working with Time Zones and Date/Time Data | - Time zone conversion functions - TIMESTAMP, INTERVAL data types | |
| Manipulating Data and Managing Transactions | - Transaction control: COMMIT, ROLLBACK, SAVEPOINT - INSERT, UPDATE, DELETE, MERGE statements - Multi-table inserts |
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NEW QUESTION # 199
Which statement is true about TRUNCATEand DELETE?
Answer: B
Explanation:
Explanation/Reference: https://www.sqlservercentral.com/articles/difference-between-truncate-and-delete
NEW QUESTION # 200
Which three statements are true about the ALTER TABLE....DROP COLUMN....
command?
Answer: A,C,D
NEW QUESTION # 201
See the Exhibit and examine the structure of the PROMOTIONS table:
Using the PROMOTIONS table,
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: A
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 # 202
Examine the description of the BOOKS_TRANSACTIONS table:
Which two WHERE conditions give the same result?
Answer: C,D
Explanation:
The WHERE clause in SQL filters the rows returned by the SELECT statement. The result of logical operators and conditions can change significantly depending on the use of parentheses.
Options A and E both use parentheses to ensure that borrowed_date = SYSDATE is evaluated with transaction_type ='RM' as one group and the member_id conditions as another group. The parentheses ensure that both conditions within each set of parentheses must be true for the rows to be included.
Option B is incorrect because it does not use parentheses to enforce the grouping of conditions, leading to potentially different results due to the way logical OR works.
Option C is incorrect because it has a syntax error; it is missing a parenthesis.
Option D is incorrect because it will return rows where either borrowed_date = SYSDATE AND transaction_type ='RM' is true or member_id IN ('A101','A102') is true, which is a broader condition than what's specified in options A and E.
NEW QUESTION # 203
Which three privileges can be restricted to a subset of columns in a table?
Answer: C,D,E
Explanation:
B: True. The REFERENCES privilege can be granted on specific columns within a table. This is necessary when a user needs to define foreign key constraints that reference those particular columns.
C: True. The UPDATE privilege can be granted on specific columns, allowing users to update only designated columns within a table. This is useful for restricting write access to sensitive or critical data within a table.
F: True. The INSERT privilege can also be granted on specific columns, meaning a user can be permitted to insert data into only certain columns of a table. This helps in maintaining data integrity and controlling access to data fields based on user roles.
NEW QUESTION # 204
......
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