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VCE
Which two are true about the USING clause when joining tables?
A. All column names in a USING clause must be qualified with a table name or table alias.
B. It can never be used with onatural join.
C. It is used to specify an equijoin of columns that have the same name in both tables.
D. It can never be used with a full outer join.
E. It is used to specify an explicit join condition involving operators.
Examine the description of the EMPLOYEES table:
The session time zone is the same as the database server
Which two statements will list only the employees who have been working with the company for more than five years?
A. SELECT employee_ name FROM employees WHERE (SYSDATE - hire_ data) / 36>;5
B. SELECT employee_ name FROM employees WHERE (SYSTIMESTAMP - hire_ data) / 365>
C. SELECT employee_ name FROM employees WHERE (CUARENT_ DATE - hire_ data / 365>5
D. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 1>; 3
E. SELECT employee_ name FROM employees WHERE (SYSNAYW - hire_ data / 1>; 3
F. SELECT employee_ name FROM employees WHERE (CUNACV_ DATE - hire_ data / 12> 3
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