Doubt Regarding Merge Statement in Oracle

Hi,
I have an SP which takes 3 parameters Lets say
(in_empid, in_empname,in_age)
here in_empid corresponds to the empid ie primary key for update/insert
Now which of the approach will be better. Will there be problem in using Merge statements for updates/insert
1. Approach 1
Add one more flag in parameters in_action . Now if in_action = 'U' then write an update statement.If in_action='I' then write insert stmnt
2. Approach 2
write a merge stmnt as follows
merge into employee e using
( select in_empid, in_empname,in_age from dual ) b
on ( b.in_empid = e.empid)
WHEN MATCHED THEN
UPDATE SET e.ENAME = in_empname,
e.age = in_age
WHEN NOT MATCHED THEN
INSERT
VALUES (in_empid,in_empname,in_age) something like that
Which would be preferred? I mean is there any restriction that merge can be used only to merge 2 tables?what are the drawbacks of using Merge?
Regds,
S

Hi cd,
Thanks for the reply.
Actaully I was keeping the front-end code also in mind.
If we click an update button, then they will have to manage a flag till the end to say that transaction was update. whereas when its an insert of new record, they have to maintain a falg till end to imply that the transaction was insert.
I want to avoid this so that they need not maintain additional flag.
Hence I was thinking of using MERGE statement.
Will there be any problem in using merge for such scenarios?
Regds,
S

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Thanks in advance!

Thanks for the suggestions. Our problem is that the base table contains 50 million rows and seven indexes, and each month we try to insert/update one million rows. Some of the data in the base table is historical so if we implemented your solution we would lose any records not being updated.
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I have two tables.Table 1 and Target.
I am using Table 1 as source to update records in target table.
I am joining the two tables on common column named ID. Datatype for ID in table 1 is VARCHAR whereas it is NUMBER in target table.
Also, Updatedate column have datatype VARCHAR in table 1 whereas it is TIMESTAMP in target table.
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STATE,
COUNTRY,
ZIP
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tgt.city = src.city,
tgt.state = src.state,
tgt.zip = src.zip,
tgt.country = src.country
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Thanks

user11018028 wrote:
I have two tables.Table 1 and Target.
I am using Table 1 as source to update records in target table.
I am joining the two tables on common column named ID. Datatype for ID in table 1 is VARCHAR whereas it is NUMBER in target table.
Also, Updatedate column have datatype VARCHAR in table 1 whereas it is TIMESTAMP in target table.
I am using the following code but getting errors:
1. Error in executing ODCIEXTTABLEFETCH
2.NON-NUMERIC character is found where a numeric was expected
Code i am using:
MERGE
INTO target tgt
USING (select
to_numbet(ID),
ADDRESS,
CITY,
STATE,
COUNTRY,
ZIP
from TABLE1 a,target b where a.ID = b.ID and
to_date(a.updatedate,'mm/dd/yyyy') > (select max(updatedate) from target)and rownum < 100) src
ON (src.ID = tgt.ID)
WHEN MATCHED
THEN
UPDATE
SET tgt.address = src.address,
tgt.city = src.city,
tgt.state = src.state,
tgt.zip = src.zip,
tgt.country = src.country
WHEN NOT MATCHED
THEN
INSERT (ID,address,city,zip,state,country)
VALUES (src.ID,src.address,src.city,src.zip,src.state,src.country)
Please suggest some solution to rectify this issue.
ThanksID column contains non-numeric data

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Hi All ,
I am using a Merge statement for multiplying a column......which works fine in XE but not in Oracle 9i
CODE
*======*
MERGE INTO MULTIPLY T USING
(SELECT CONV,ITEM FROM MULTIPLY WHERE TYP='P') X ON
(T.ITEM= X.ITEM)
WHEN MATCHED THEN UPDATE SET T.CONV =X.CONV * T.CONV WHERE TYP!='P'
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I understand that I used use one more line WHEN NOT MATCHED ..... but I am getting an Error in the Update statement where clause , whether it is not possible to combine where clause in the Merge statement
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===============
A     2
A     5
A     4     P
A     2
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======================================
ITM CONV TYP
=== ==== =====
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A 5 *4
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A 2*4
BANNER
==========
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
PL/SQL Release 10.2.0.1.0 - Production
CORE     10.2.0.1.0     Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
BANNER_
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PL/SQL Release 9.2.0.5.0 - Production
CORE     9.2.0.6.0     Production
TNS for 32-bit Windows: Version 9.2.0.5.0 - Production
NLSRTL Version 9.2.0.5.0 - Production
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Thanks
Ananda
Edited by: Ananda on Nov 13, 2008 3:49 PM
Edited by: Ananda on Nov 13, 2008 8:56 PM

Hi ,
Thanks for ur reply....
I am getting an Error as Missing Keyword and points to the WHERE in the update statement ..............
Am i doin anything wrong here in the syntax ...........but if i do the same without the where statement in Update ....... Merge works fine but with wrong output
Thanks
Ananda
Edited by: Ananda on Nov 13, 2008 4:06 PM

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hello
my pc has following configurtion
256mb ram
60gb hdd
p4 2.4 ghz
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I suggest you not to doubt regarding Oracle Database 10g Release 2 (10.2.0.1.0) installation.
It is not necessary. If you don't receive an answer within a reasonable amount of time you could edit your thread with whatever ( a period is enough) to raise it to the top once again.
It becomes difficult for us to track duplicated threads and unnecessarily duplicates efforts.
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HI I have recently my oracle version to 11.2.0.3 -64 bit . My merge statement is geeting failied saying that invlid identfier at line number 18
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which line is the line that has the error?
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Hello,
I am trying to insert into an oracle table multiple rows of values selected from a web page. Can I use a merge statement as a preparedStatement to avoid inserting duplicate records?
Does anybody have any examples they would like to share?
Any suggestions are greatly appreciated.
Thank you,
Logan

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     Statement ms = null;
     Statement ds = null;
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              ps.close();
          if (cs != null) {
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Hi All,
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Thanks,
MK.

Hi,
Maddy wrote:
... WHEN NOT MATCHED THEN
INSERT(account_id, subscriber_id, status_account_type)
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VALUES (paris_accounts.account_id, paris_accounts.subscriber_id, paris_accounts.status, paris_accounts.account_type);you might spot the error yourself.
Always format your code. When you post any formatted text on thsi site, type these 6 characters:
\(small letters only, inside curly brackets) before and after formatted text, to preserve spacing.

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http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:35615502072484

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Doubt Regarding Merge Statement in Oracle

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