1z0-071 Exam Dumps | Examine this query: SELECT SUBSTR (SYSDATE,1,5) 'Result' FROM DUAL Which statement is true?

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Question 82/139

Examine this query:
SELECT SUBSTR (SYSDATE,1,5) 'Result' FROM DUAL
Which statement is true?

A. It fails unless the expression is modified to TO-CHAR(SUNBSTR(SYSDATE,1,5)

B. It fails unless the expression is modified to SUBSTR (TO_ CHAR(SYSDATE),1,5)

C. It fails unless the expression is modified to SUBSTR (TO_ CHAR(TRUNC(SYSDATE)),1,5)

D. It executes successfully with an implicit data type conversion

Correct Answer: B

In Oracle Database 12c, the SYSDATE function returns a date value in the current session's date format. The SUBSTR function is used to extract a substring from a string. However, SYSDATE is a DATE data type and not a string, so you cannot directly use SUBSTR on it. Therefore, SYSDATE must first be converted to a character data type using the TO_CHAR function before applying the SUBSTR function.
Therefore, the correct form of the query should be:
SELECT SUBSTR(TO_CHAR(SYSDATE), 1, 5) AS "Result" FROM DUAL;
This converts the current date and time to a string using the default date format and then extracts the first 5 characters from it.

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