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Oracle Database SQL Sample Questions (Q308-Q313):

NEW QUESTION # 308
Examine the description of the PRODCTS table which contains data:

Which two are true?

A. The PROD_ ID column data type can be changed to VARCHAR2 (2).
B. The EXPIRY DATE column data type can be changed to TIME STAMP.
C. The EXPIRY DATE column cannot be dropped.
D. The PROD ID column can be renamed.
E. The PROD NAME column cannot have a DEFAULT clause added to it.

Answer: B,D

NEW QUESTION # 309
Whith three statements are true about built in data types?

A. A CHAR column definition does not require the length to be specified
B. The default length for a CHAR column is always one character
C. A VARCHAR2 blank pads column values only if the data stored is non numeric and contains no special characlers
D. A VARCHAR2 column definition does not require the length to be specified
E. A BFILE stores unstructured binary data in operating systerm files
F. A BLOB stores unstructured binary data within the database

Answer: B,E,F

Explanation:
The true statements about built-in data types in Oracle are:
* B: A BFILE is a data type in Oracle that allows for a read-only link to binary files stored outside the database in the operating system. This is correct as per Oracle's documentation.
* D: The default length for a CHAR column, when not specified, is one character. This is according to the Oracle SQL standard.
* F: A BLOB is used for storing binary data within the Oracle database, allowing for storage of large amounts of unstructured binary data.
The incorrect options are:
* A: A VARCHAR2 column does not blank-pad values; it is CHAR that may blank-pad to the fixed length.
* C: A CHAR column requires a length specification, although if omitted, the default is one character.
* E: A VARCHAR2 column requires a length specification; without it, the statement will fail.
References:
* Oracle Documentation on Data Types: Data Types
* Oracle Documentation on LOBs: LOBs
* Oracle Documentation on Character Data Types: Character Data Types

NEW QUESTION # 310
You want to return the current date and time from the user session, with a data type of TIMESTAMP WITH TIME ZONE.
Which function will do this?

A. LOCALTIMESTAMP
B. CURRENT DATE
C. CURRENT_ TIMESTAMP
D. SYSDATE

Answer: C

Explanation:
* A: CURRENT_DATE returns the current date in the session time zone, not with a TIMESTAMP WITH TIME ZONE data type.
* B: CURRENT_TIMESTAMP returns the current date and time in the session time zone with a TIMESTAMP WITH TIME ZONE data type. This is correct.
* C: SYSDATE returns the current date and time from the operating system of the database server in the DATE data type.
* D: LOCALTIMESTAMP returns the current date and time in the session time zone with a TIMESTAMP data type, without the TIME ZONE.
The TIMESTAMP WITH TIME ZONE data type and relevant functions are documented in the Oracle Database SQL Language Reference 12c.

NEW QUESTION # 311
Which two statements are true about the COUNT function?

A. It can only be used for NUMBER data types.
B. COUNT(*) returns the number of rows in a table including duplicate rows and rows containing NULLs in any column.
C. COUNT (DISTINCT inv_amt) returns the number of rows excluding rows containing duplicates and NULLs in the INV_AMT column
D. A SELECT statement using the COUNT function with a DISTINCT keyword cannot have a WHERE clause.
E. COUNT(inv_amt) returns the number of rows in a table including rows with NULL in the INV_AMT column.

Answer: B,C

NEW QUESTION # 312
View the Exhibit and examine the structure of ORDERS and ORDER_ITEMS tables.
ORDER_ID is the primary key in the ORDERS table and the foreign key of the ORDER_ITEMS table, whose constraint is defined with the ON DELETE CASCADE option.
Which DELETE statement would execute successfully?

A. DELETE order_idFROM ordersWHERE order_total < 1000;
B. DELETE ordersWHERE order_total < 1000;
C. DELETE orders o, order_items iWHERE o.order_id = i.order_id;
D. DELETEFROM ordersWHERE (SELECT order_idFROM order_items);

Answer: B

NEW QUESTION # 313
......

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Oracle Database SQL Sample Questions (Q308-Q313):

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