[Mar 01, 2023] Today Updated 1z1-909 Exam Dumps Actual Questions
1z1-909 exam dumps with real Oracle questions and answers
Oracle 1z1-909 Exam Syllabus Topics:
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NEW QUESTION 16
Which two statements are true about aggregate functions?
- A. MAX () returns null if there are no rows to aggregate.
- B. MIN () cannot use distinct when it executes as a Windows function.
- C. AVG () does not allow use of the distinct option.
- D. COUNT (distinct) returns a count of the number of rows with different values including Null.
- E. SUM () returns o if there are no rows to aggregate.
Answer: C
NEW QUESTION 17
Examine the output:
Which explain command will obtain the output?
- A. EXPLAIN PARTITIONS
- B. EXPLAIN PORMAT=JSON
- C. EXPLAIN PORMAT^TRADITIONAL
- D. EXPLAIN FORMAT=TREE
- E. EXPLAIN ANALYZE
Answer: B
NEW QUESTION 18
Which two differences exist between the timestamp and date time data types?
- A. timestamp stores the interval between two dates.
- B. timestamp uses less storage space.
- C. timestamp stores more decimal points in seconds
- D. timestamp converts the value based on the session time zone.
- E. timestamp has larger range of values.
Answer: B,D
NEW QUESTION 19
Examine these commands which execute successfully in the sequence shown in Sessions S1 and S2:
Now, examine this statement that execute successfully in s1:
S1> SELECT * FROM emp;
Which is true about the result of the select statement?
- A. The inserted row is returned because the transaction is auto committed in S2.
- B. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
- C. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
- D. The inserted row is not returned because the transaction still active in s2.
Answer: A
NEW QUESTION 20
The variables c and d are declared as integer types.
Examine these initialization statements with placeholder value <p1>, which execute successfully:
Now, examine this loop which executes successfully:
Which loop results in the same value of d for all valid values of <p1>?
A)
B)
C)
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: B
NEW QUESTION 21
The collection col contains all episodes for all seasons for a TV show.
Examine this document which has an example of the details for each episode:
Which query returns all expisode names from the first season?
- A. SELECT doc->"$.name" FROM col WHERE doc->"$.season" = "1";
- B. SELECT doc->,$.name,, FROM col WHERE doc->"$ . season" = "1";
- C. SELECT name FROM col WHERE season = 1;
- D. SELECT "S.name" FROM col WHERE "S.season" = "1";
Answer: D
NEW QUESTION 22
Examine the content of the employee table:
Now examine this PHP script:
Finally examine this desired output:
- A. $options = [PDO:: ATTR_DEFAOLT_FETCH__MODE => PDO : : FETCH_BOTH] ;
- B. $options = [PDO:: ATTR__DEFAULT_FETCH MODE => PDO: :FETCH_CLASS] ;
- C. $options = [PDO:: ATTR_DEFAUXT_FETCH__MODE => PDO: : PDO: :FETCH_OBJ] ;
- D. $options = [PDO:: ATTR_DEFAULT_FETCH__MODE => PDO: : FETCH_ASSOC] ;
Answer: A
NEW QUESTION 23
Which two are true about indexes?
- A. Indexes contain rows sorted by key values.
- B. Secondary index access will always be faster than a table scan.
- C. Indexes reduce disk space used.
- D. Indexing all of a table's columns improves performance.
- E. Indexes are used to enforce unique constraints.
Answer: C,D
NEW QUESTION 24
Examine the Test.php script which is numbered for clarity, and its output:
PHP Fatal error: Uncaught Error: call to underined function mysqli_connect () in Test.php:2 Which action will fix this error?
- A. Enable the mysqli extension in the php.ini file.
- B. Install the PHP executable in the path used by the MySQL installation.
- C. Replace line 2 With: Slink = mysql_xdevapi\getSession
("mysqlx://username:password@localhost:3306","schema"); - D. Replace line 2 with Slink = mysql.connect {"localhost: 3306n, "username", "pas "schema") ;
Answer: C
NEW QUESTION 25
Examine the employee table structure:
Which set of statements immediately returns empname for a given emp_id by using a parameterized prepare statement?
A)
D)
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: D
NEW QUESTION 26
Examine these statement which execute successfully:
Now, examine this desired output:
Which two queries will produce the out?
- A.
- B.
- C.
- D.
- E.
Answer: A,C
NEW QUESTION 27
Examine these statements which execute successfully:
Now, examine this query:
What is the result?
- A. It fails with a warning.
- B. It inserts a row with a warning.
- C. It inserts a row with an error.
- D. It fails with an error.
- E. It inserts a row with no error or warning.
Answer: E
NEW QUESTION 28
Examine these statements which execute successfully:
Which two changes will improve this query performance?
- A. CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH
- B. CREATE INDEX 1X5 ON users (loc_id);
- C. CREATE INDEX IX1 ON locations (loc_shareci) ;
- D. CREATE INDEX 1X4 ON Locations (site_id, loc_shared);
- E. CREATE INDEX 1X3 ON locations <loc_site_id) ;
- F. CREATE INDEX 1X6 ON users (user_name);
- G. CREATE INDEX 1X7 ON users (user_name) USING HASH;
Answer: F,G
NEW QUESTION 29
Examine these statement which execute successfully:
Now, examine the statements executed in the mysqi command-line client:
What is true?
- A.
- B.
- C.
- D.
Answer: B
NEW QUESTION 30
Examine this statement which executes successfully:
CREATE TABLE 'fshop' ('product' JSON DEFAULT NULL ) ENGINE=InnoDB;
Now, examine a json value contained in the table:
{"name" : "orange", "varieties" : [{"VarietyName":"Clementine", "Origin" : ["PA", "BU"] }, {"VarietyName": "tangerine", "Origin" : ["CH","JP"]>]> Which will cause documents to be indexed over the 'name' key?
- A. ALTER TABLE fshop ADD COLUMN name VARCHAR(20), ADD KEY idx_name (name) ;
- B. ALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product->' S - name' ) VIRTUAL, ADD KEY idx_name (name) ;
- C. ALTER TABLE fshop ADD COLUMN name VARCHAR(20) AS (product-
>* S .varieties. VarietyName ' ) VIRTUAL, ADD KEY idx_name (name.) ; - D. ALTER TABLE fshop ADD COLUMN name VARCHAR(100) AS (product->' S - varieties' ) VIRTUAL, ADD KEY idx_name (name) ;
- E. ALTER TABLE fshop ADD name VARCHAR(20) AS (JSON_ONQUOTE (product->"S.varieties.VarietyName")), ADD INDEX (name);
Answer: D
NEW QUESTION 31
The meeting table stores meeting schedules with participants from five continents. The participants' details are stored in another table.
You need to adjust the start_time and duration columns for optimal storage. What datatype changes would achieve this?
- A. start_time DATETIME duration DATETIME
- B. start__time DATETIME duration TIME
- C. start_time TIMESTAMP duration TIMESTAMP
- D. start_time TIMESTAMP duration TIME
- E. start_time TIME duration TIME
Answer: A
NEW QUESTION 32
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