84.View the Exhibit and examine the structure of the EMPLOYEES table.
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84.View the Exhibit and examine the structure of the EMPLOYEES table.
Examine the data in the ENAME and HIREDATE columns of the EMPLOYEES table:
ENAME HIREDATE
SMITH 17-DEC-80
ALLEN 20-FEB-81
WARD 22-FEB-81
You want to generate a list of user IDs as follows:
USERID
Smi17DEC80
All20FEB81
War22FEB81
You issue the following query:
SQL>SELECT CONCAT(SUBSTR(INITCAP(ename),1,3), REPLACE(hiredate,'-')) "USERID" FROM employees;
What is the outcome?
A.It executes successfully and gives the correct output.
B.It executes successfully but does not give the correct output.
C.It generates an error because the REPLACE function is not valid.
D.It generates an error because the SUBSTR function cannot be nested in the CONCAT function.
答案：A
Examine the data in the ENAME and HIREDATE columns of the EMPLOYEES table:
ENAME HIREDATE
SMITH 17-DEC-80
ALLEN 20-FEB-81
WARD 22-FEB-81
You want to generate a list of user IDs as follows:
USERID
Smi17DEC80
All20FEB81
War22FEB81
You issue the following query:
SQL>SELECT CONCAT(SUBSTR(INITCAP(ename),1,3), REPLACE(hiredate,'-')) "USERID" FROM employees;
What is the outcome?
A.It executes successfully and gives the correct output.
B.It executes successfully but does not give the correct output.
C.It generates an error because the REPLACE function is not valid.
D.It generates an error because the SUBSTR function cannot be nested in the CONCAT function.
答案：A
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