Oracle9i DBA JumpStart

1.

What is another way to write the following SQL statement by using another function?

select empno || lpad(initcap(ename), 40-length(empno),’.’) "Employee Directory" from emp;

2.

Which function would you use to perform an explicit conversion from a number to a string?

3.

How can you rewrite the function call NUMTOYMINTERVAL(17,’year’) using the function TOYMINTERVAL?

4.

What is the result of a number added to a NULL value?

5.

What is the result of formatting the number -232.6 using the format mask ‘9999.99S’?

6.

Rank the following operators or conditionals based on priority, from highest to lowest: *, OR, ||, >=

7.

The DUAL table has how many rows and how many columns?

8.

True or false: Strings and numbers can be concatenated.

9.

Write a SELECT statement with a built-in function or functions that will format the string ‘Queen’ with the ‘!’ character padded for a total of 20 characters on the left side, and with the ‘?’ character padded for a total of 30 characters on the right. (Hint: Use nested functions.)

10.

What functionality does the new Oracle TIMESTAMP datatype have over the DATE datatype?

1.

You can rewrite the statement using the CONCAT function:

select concat(empno, lpad(initcap(ename), 40-length(empno),’.’) "Employee Directory" from emp;

2.

You can use the TOCHAR function to convert a number to a string.

3.

You can rewrite the function call as TOYMINTERVAL(‘17-00’).

4.

The result of a number added to a NULL is NULL.

5.

The resulting format is 232.60-.

6.

*, ||, >=, OR

7.

The DUAL table has one row and one column. The column is named DUMMY and has a value of ‘X’.

8.

True, before the number is concatenated with the string, it is implicitly converted to a string.

9.

select rpad(lpad(‘Queen’,20,’!’),30,’?’) from dual;

RPAD(LPAD(‘QUEEN’,20,’!’),30,’ ------------------------------ !!!!!!!!!!!!!!!Queen??????????

10.

The TIMESTAMP datatype stores the time in seconds to up to nine digits of precision.