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Duplicate rows check on Insert or PLSQL block

I want to do a check when inserting data into a table to make sure that there are no duplicate rows


lets say i have 3 columns, when the data 1, 2, 3. if i try inserting that same data, the insert should fail.

what direction should i go in and can someone give some brief examples
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futureDBA
Asked:
futureDBA
1 Solution
 
slightwv (䄆 Netminder) Commented:
Can you not create a unique index on those 3 columns?

Otherwise you need to seleect those 3 columns before you insert.
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Gerwin Jansen, EE MVETopic Advisor Commented:
Create a 3 column unique index I would say.

@slightwv - crosspost...
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futureDBAAuthor Commented:
I am not sure what you mean, this is my first time hearing the term.. i will head to google, if you can provide documentation and examples that would be extremely helpful
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slightwv (䄆 Netminder) Commented:
>>I am not sure what you mean, this is my first time hearing the term

What term?  "Unique index"?
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awking00Commented:
The following is an example of how the unique index on multiple columns will prevent duplicate values for those columns:
create table idxtbl
(id varchar2(1)
,col1 number
,col2 number
,col3 number);

insert into idxtbl values('A',1,2,3);
insert into idxtbl values('B',4,5,6);

create unique index tbl3cols on idxtbl(col1, col2, col3);

insert into idxtbl values('C',1,2,3);
ERROR at line 1:
ORA-00001: unique constraint (SCHEMANAME.TBL3COLS) violated
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futureDBAAuthor Commented:
yes, the term unique index. i will look into this now. thank you
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slightwv (䄆 Netminder) Commented:
awking00 has already provided a working example.
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_alias99Commented:
I've requested that this question be closed as follows:

Accepted answer: 250 points for awking00's comment #a38326303
Assisted answer: 250 points for slightwv's comment #a38325683

for the following reason:

All,<br /><br />I'm splitting the points per Expert's request:<br /><a href="http://www.experts-exchange.com/R_10542.html">http://www.experts-exchang<wbr />e.com/R_10<wbr />542.html</a><br /><br />The original closure included only <a href="http:#a38326303">http:#a38326303</a><br /><br />_alias99<br />Community Support Moderator
0
 
futureDBAAuthor Commented:
perfect, thank you for taking so long to close
0

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