Answer / dinesh

Its not batter to modify where clause column with function(Performance issue). So we need to create function based index. Eg.
Create Index Fun_indx on EMP (UPPER(FIRST_NAME).
we can't create function based index on aggregate function.
but we can create NVL function as function.
also we can create function based index on user define function but function should be"DETERMINISTIC".
eg
create or replace function fun_index(a in number) Return
Number DETERMINISTIC IS
BEGIN
'''
,,,
END;

how do you restrict number of rows for a particular value in a column.For example:there is a table called fruits,having apples,bananas ,papayas.I dont want to have more than 100 apples in that table ,so how can u restrict number of rows for apple to hundred?

6 Answers  

---

where are cookies actually stored on the hard disk? : Sql dba

0 Answers  

---

Explain how to use transactions efficiently : transact sql

0 Answers  

---

Suppose There is a string A.B....C.......D.........E........F In this string dots (.) are not having fixed count in between of string. I want the output to have string with one dot between. I.e. A.B.C.D.E.F

6 Answers   IBM,

---

Are subqueries faster than joins?

0 Answers  

---

Why do we use procedures in pl sql?

0 Answers  

---

what is the difference between varray and table data type..please expalain with some examples... under what situation you will go for varray..instead of index by table...

1 Answers   HCL, Satyam,

---

What is the difference between rename and alias?

0 Answers  

---

Why do we use cursors?

0 Answers  

---

What is hibernate and its relation to sql?

0 Answers  

---

What are all the different normalization?

0 Answers  

---

What is denormalization in a database?

0 Answers  

---