How to use an index

Hi,
Can someone tell me how can I use a index of row?
I want to see if any value is repeated in a column something like
declare
x number;
type my_table is table of number;
var_c1 my_table;
begin
for i in 1..6 loop
select round(dbms_random.value(1, 49),0) bulk collect into var_c1 from dual;
if var_c1(i) = var_c1(i).next then
dbms_output.put_line(var_c1(1));
end if;
end loop;
end;
thank you

I am sorry but I do not understand the question.
If you want to see if each row is unique just try and create a unique index on the column or select column_name, count(column_name) group by column_name order by 2 or something similar.
John
www.jhdba.wordpress.com

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Edited by: 007 on Jun 6, 2013 7:56 AM
Edited by: 007 on Jun 6, 2013 8:06 AM
Edited by: 007 on Jun 6, 2013 8:06 AM
Edited by: 007 on Jun 6, 2013 8:06 AM
Edited by: 007 on Jun 6, 2013 8:12 AM

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Plan hash value: 2951343571
| Id | Operation        | Name      | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |           |    24 |   528 |     1   (0)| 00:00:01 |
|* 1 | INDEX FULL SCAN | ENAME_IDX |    24 |   528 |     1   (0)| 00:00:01 |
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Index 2D Array.PNG ‏2 KB

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Thank you.

Thank you.
Ok, let me see if I understand it. So, having an
index may not speed things up.True
Full table scans are not bad at all -- as I have it
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>
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>
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