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Oracle Database SQL Sample Questions (Q169-Q174):

NEW QUESTION # 169
Which two statements are true about single row functions?

A. CONCAT: can be used to combine any number of values
B. MOD: returns the quotient of a division operation
C. CEIL: can be used for positive and negative numbers
D. FLOOR: returns the smallest integer greater than or equal to a specified number
E. TRUNC: can be used with NUMBER and DATE values

Answer: C,E

Explanation:
Single-row functions operate on single rows and return one result per row. Let's look at each option in the context of Oracle 12c SQL:
* A. CONCAT: This function can only combine two values at a time. If you need to concatenate more than two values, you have to nest CONCAT functions or use the || operator.
* B. MOD: The MOD function returns the remainder of a division operation, not the quotient.
* C. CEIL: This function returns the smallest integer that is greater than or equal to a specified number. It works with both positive and negative numbers.
* D. FLOOR: It returns the largest integer that is less than or equal to the specified number, not greater than or equal to.
* E. TRUNC: This function can indeed be used with both NUMBER and DATE values to truncate them to a specified number of decimal places or to a particular component of a date.
References:
* Oracle Database SQL Language Reference 12c Release 1 (12.1), Functions
* Oracle Database SQL Language Reference 12c Release 1 (12.1), CONCAT Function
* Oracle Database SQL Language Reference 12c Release 1 (12.1), MOD Function
* Oracle Database SQL Language Reference 12c Release 1 (12.1), CEIL and FLOOR Functions
* Oracle Database SQL Language Reference 12c Release 1 (12.1), TRUNC Function

NEW QUESTION # 170
Which statement is true about the INTERSECT operator used in compound queries?

A. It processes NULLs in the selected columns.
B. Multiple INTERSECT operators are not possible in the same SQL statement.
C. INTERSECT is of lower precedence than UNION or UNION ALL.
D. It ignores NULLs.

Answer: A

NEW QUESTION # 171
Whith three statements are true about built in data types?

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

Answer: B,C,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.
Reference:
Oracle Documentation on Data Types: Data Types
Oracle Documentation on LOBs: LOBs
Oracle Documentation on Character Data Types: Character Data Types

NEW QUESTION # 172
You need to calculate the number of days from 1st January 2019 until today.
Dates are stored in the default format of DD-MON-RR.
Which two queries give the required output?

A. SELECT ROUND (SYSDATE-TO_DATE ('01/JANUARY/2019')) FROM DUAL;
B. SELECT TO_CHAR (SYSDATE, 'DD-MON-YYYY')-'01-JAN-2019' FROM DUAL;
C. SELECT TO_DATE (SYSDATE, 'DD/MONTH/YYYY')-'01/JANUARY/2019' FROM DUAL;
D. SELECT SYSDATE-TO_DATE ('01-JANUARY-2019') FROM DUAL;
E. SELECT ROUND (SYSDATE- '01-JAN-2019') FROM DUAL;

Answer: A,D

NEW QUESTION # 173
Which two are true about queries using set operators such as UNION?

A. Queries using set operators do not perform implicit conversion across data type groups (e.g. character, numeric)
B. In a query containing multiple set operators INTERSECT always takes precedence over UNION and UNION ALL
C. All set operators are valid on columns all data types.
D. CHAR columns of different lengths used with a set operator retum a vAacsua mhtoe e equals the longest CHAR value.
E. An expression in the first SELECT list must have a column alias for the expression

Answer: A,C

NEW QUESTION # 174
......

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