Merge Statement in Oracle

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.
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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The new MERGE statement in Oracle 9i

Has anyone used the new Merge statement to process large amounts of data? Currently we use PL/SQL to update/insert into our tables when we are loading large amounts of data (close to one million rows) because we can set commit points and avoid rollback problems. I am wondering if we use Merge instead how this will affect rollback? Are we still going to have to code for this problem?
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FOR cur_rec in c1 LOOP
UPDATE table a
SET col a = cur_rec.col a, ...
WHERE ...
IF SQL%NOTFOUND THEN
INSERT (col a , col b, col c...)
VALUES (cur_rec.col a, cur_rec.col b...);
END IF;
We commit every 10,000 records (as determined by SQL%ROWCOUNT). This can be time comsuming and Oracle claims that the new MERGE command will avoid costly overhead and reduce data scans. However, I am concerned that we may hit rollback problems if we implement a straight SQL statement such as MERGE. Any thoughts?

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
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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
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write a merge stmnt as follows
merge into employee e using
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INSERT
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Hi cd,
Thanks for the reply.
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Regds,
S

Error in Merge statement for Oracle 10gR2

Hi,
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Hi All ,
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CODE
*======*
MERGE INTO MULTIPLY T USING
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ITM     CONV     TYP
===============
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A     5
A     4     P
A     2
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======================================
ITM CONV TYP
=== ==== =====
A 2 *4
A 5 *4
A 4 P
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_
Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production
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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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

Oracle 9.2i - Log Errors in a Merge Statement

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Depending on what type of errors you expect, you may be helped by deferring your constraints: unique, foreign key and check constraints can be deferred; that means they are only enforced when you commit.
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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?
merge INTO peer_index indx
USING staging.stg_peer_filing stg
ON (indx.peer_element_code = stg.fund_code AND indx.index_effective_date = Trunc
(stg.pricing_date))
WHEN matched THEN
UPDATE SET indx.filing_date = Trunc(stg.filing_date),
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             indx.last_update_user_id = USER
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          index_effective_date,
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VALUES ((SELECT pe.index_code_prefix
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          Trunc(stg.filing_date),
          Trunc(stg.pricing_date),
          stg.net_assets,
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Can sql merge statement be used in a batch (oracle 10g)?

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

I've implemented this by batch inserting into a temp table then running a merge then dropping the temp table.
public void mergeMethod() {
        final String createsql = "CREATE TABLE temp (a INTEGER, b INTEGER, c INTEGER)";
        final String insertsql = "INSERT INTO temp (a, b, c) VALUES (?,?,?)";
        final String mergesql = "MERGE INTO my_table A " +
           "USING temp B ON (A.a = B.a AND A.b = B.b) " +
           "WHEN MATCHED THEN UPDATE SET A.c = B.c " +
           "WHEN NOT MATCHED THEN INSERT (A.id, A.a, A.b, A.c) " +
           "VALUES (my_seq.Nextval,B.a,B.b,B.c)";
        final String dropsql = "DROP TABLE temp";
     Connection conn = null;
     Statement cs = null;
     Statement ms = null;
     Statement ds = null;
     PreparedStatement ps = null;
     boolean retValue = false;
     try {
          conn = getConnection();
          conn.setAutoCommit(false);
          cs = conn.createStatement();
          ms = conn.createStatement();
          ds = conn.createStatement();
          ps = conn.prepareStatement(insertsql);
          for (int i=0; i< 10; i++){
               ps.setInt(1, i);
               ps.setInt(2, i+1);
               ps.setInt(3, i+2);
               ps.addBatch();
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          cs.execute(createsql);
          // execute in batch
          final int updateCount[] = ps.executeBatch();
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          ms.execute(mergesql);
          // drop the temp table
          ds.execute(dropsql);
          conn.commit();
          System.out.println("Rows is updated: " + updateCount.length);
     } catch (final SQLException e) {
          if (conn != null) {
              conn.rollback();
          throw e;
     } finally {
          if (ps != null) {
              ps.close();
          if (cs != null) {
              cs.close();
          if (ms != null) {
              ms.close();
          if (ds != null) {
              ds.close();
          if (conn != null) {
              conn.close();
}

Issue with Oracle Merge statements (PL/SQL: ORA-00913: too many values)

Hi All,
I am using the below merge statement and I am getting too many rows issues when I am compiling.
BEGIN
FOR te_rec IN ( SELECT /*+ parallel(ts,4) */ te.dtv_acct_num FROM telcos_eligible te, telcos_setup ts, telcos_partners tp
WHERE tp.telcos_name = UPPER((p_telcos_name))
AND ts.partner_id = tp.partner_id
AND te.ts_id = ts.ts_id ) LOOP
MERGE INTO tcs_accounts
USING (
SELECT /*+ DRIVING_SITE(a) */account_id, a.subscriber_id, status, account_type FROM account@tcs_to_paris a WHERE a.subscriber_id = te_rec.dtv_acct_num
) paris_accounts
ON (tcs_accounts.subscriber_id = paris_accounts.subscriber_id)
WHEN MATCHED THEN
UPDATE SET
account_type = paris_accounts.account_type,
subscriber_id = paris_acounts.subscriber_id,
status = paris_accounts.status
WHEN NOT MATCHED THEN
INSERT(account_id, subscriber_id, status_account_type)
VALUES(paris_accounts.account_id, paris_accounts.subscriber_id, paris_accounts.status, paris_accounts.account_type);
END LOOP;
END;
Can you let me know what is the issue here.
Thanks,
MK.

Hi,
Maddy wrote:
... WHEN NOT MATCHED THEN
INSERT(account_id, subscriber_id, status_account_type)
VALUES(paris_accounts.account_id, paris_accounts.subscriber_id, paris_accounts.status, paris_accounts.account_type);This is one of the many times when a little formatting can really help you. Anybody can forget a column (or have an extra one, or type a _ when they mean ,) but if you write code like this
INSERT ( account_id, subscriber_id, status_account_type)
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.

Question on passing string values to Partition clause in a merge statement

Hello All,
I am using the below code to update specific sub-partition data using oracle merge statements.
I am getting the sub-partition name and passing this as a string to the sub-partition clause.
The Merge statement is failing stating that the specified sub-partition does not exist. But the sub-partition do exists for the table.
We are using Oracle 11gr2 database.
Below is the code which I am using to populate the data.
declare
ln_min_batchkey PLS_INTEGER;
ln_max_batchkey PLS_INTEGER;
lv_partition_name VARCHAR2 (32767);
lv_subpartition_name VARCHAR2 (32767);
begin
FOR m1 IN ( SELECT (year_val + 1) AS year_val, year_val AS orig_year_val
FROM ( SELECT DISTINCT
TO_CHAR (batch_create_dt, 'YYYY') year_val
FROM stores_comm_mob_sub_temp
ORDER BY 1)
ORDER BY year_val)
LOOP
lv_partition_name :=
scmsa_handset_mobility_data_build.fn_get_partition_name (
p_table_name => 'STORES_COMM_MOB_SUB_INFO',
p_search_string => m1.year_val);
FOR m2
IN (SELECT DISTINCT
'M' || TO_CHAR (batch_create_dt, 'MM') AS month_val
FROM stores_comm_mob_sub_temp
WHERE TO_CHAR (batch_create_dt, 'YYYY') = m1.orig_year_val)
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lv_subpartition_name :=
scmsa_handset_mobility_data_build.fn_get_subpartition_name (
p_table_name => 'STORES_COMM_MOB_SUB_INFO',
p_partition_name => lv_partition_name,
p_search_string => m2.month_val);
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IF lv_subpartition_name IS NULL
THEN
                         DBMS_OUTPUT.PUT_LINE('INSIDE IF => '||m2.month_val);
INSERT INTO STORES_COMM_MOB_SUB_INFO T1 (
t1.ntlogin,
t1.first_name,
t1.last_name,
t1.job_title,
t1.store_id,
t1.batch_create_dt)
SELECT t2.ntlogin,
t2.first_name,
t2.last_name,
t2.job_title,
t2.store_id,
t2.batch_create_dt
FROM stores_comm_mob_sub_temp t2
WHERE TO_CHAR (batch_create_dt, 'YYYY') = m1.orig_year_val
AND 'M' || TO_CHAR (batch_create_dt, 'MM') =
m2.month_val;
ELSIF lv_subpartition_name IS NOT NULL
THEN
                    DBMS_OUTPUT.PUT_LINE('INSIDE ELSIF => '||m2.month_val);
MERGE INTO (SELECT *
FROM stores_comm_mob_sub_info
SUBPARTITION (lv_subpartition_name)) T1
USING (SELECT *
FROM stores_comm_mob_sub_temp
WHERE TO_CHAR (batch_create_dt, 'YYYY') =
m1.orig_year_val
AND 'M' || TO_CHAR (batch_create_dt, 'MM') =
m2.month_val) T2
ON (T1.store_id = T2.store_id
AND T1.ntlogin = T2.ntlogin)
WHEN MATCHED
THEN
UPDATE SET
t1.postpaid_totalqty =
(NVL (t1.postpaid_totalqty, 0)
+ NVL (t2.postpaid_totalqty, 0)),
t1.sales_transaction_dt =
GREATEST (
NVL (t1.sales_transaction_dt,
t2.sales_transaction_dt),
NVL (t2.sales_transaction_dt,
t1.sales_transaction_dt)),
t1.batch_create_dt =
GREATEST (
NVL (t1.batch_create_dt, t2.batch_create_dt),
NVL (t2.batch_create_dt, t1.batch_create_dt))
WHEN NOT MATCHED
THEN
INSERT (t1.ntlogin,
t1.first_name,
t1.last_name,
t1.job_title,
t1.store_id,
t1.batch_create_dt)
VALUES (t2.ntlogin,
t2.first_name,
t2.last_name,
t2.job_title,
t2.store_id,
t2.batch_create_dt);
END IF;
END LOOP;
END LOOP;
COMMIT;
end;
Much appreciate your inputs here.
Thanks,
MK.

I've not used partitioning, but I do not see MERGE supporting a variable as a partition name in
MERGE INTO (SELECT *
FROM stores_comm_mob_sub_info
SUBPARTITION (lv_subpartition_name)) T1
USING ... I suspect it is looking for a partition called lv_subpartition_name.
I also don't see why you need that partition name - the ON clause should be able to identify the partition's criteria.

Issue while using SUBPARTITION clause in the MERGE statement in PLSQL Code

Hello All,
I am using the below code to update specific sub-partition data using oracle merge statements.
I am getting the sub-partition name and passing this as a string to the sub-partition clause.
The Merge statement is failing stating that the specified sub-partition does not exist. But the sub-partition do exists for the table.
We are using Oracle 11gr2 database.
Below is the code which I am using to populate the data.
declare
ln_min_batchkey PLS_INTEGER;
ln_max_batchkey PLS_INTEGER;
lv_partition_name VARCHAR2 (32767);
lv_subpartition_name VARCHAR2 (32767);
begin
FOR m1 IN ( SELECT (year_val + 1) AS year_val, year_val AS orig_year_val
FROM ( SELECT DISTINCT
TO_CHAR (batch_create_dt, 'YYYY') year_val
FROM stores_comm_mob_sub_temp
ORDER BY 1)
ORDER BY year_val)
LOOP
lv_partition_name :=
scmsa_handset_mobility_data_build.fn_get_partition_name (
p_table_name => 'STORES_COMM_MOB_SUB_INFO',
p_search_string => m1.year_val);
FOR m2
IN (SELECT DISTINCT
'M' || TO_CHAR (batch_create_dt, 'MM') AS month_val
FROM stores_comm_mob_sub_temp
WHERE TO_CHAR (batch_create_dt, 'YYYY') = m1.orig_year_val)
LOOP
lv_subpartition_name :=
scmsa_handset_mobility_data_build.fn_get_subpartition_name (
p_table_name => 'STORES_COMM_MOB_SUB_INFO',
p_partition_name => lv_partition_name,
p_search_string => m2.month_val);
                    DBMS_OUTPUT.PUT_LINE('The lv_subpartition_name => '||lv_subpartition_name||' and lv_partition_name=> '||lv_partition_name);
IF lv_subpartition_name IS NULL
THEN
                         DBMS_OUTPUT.PUT_LINE('INSIDE IF => '||m2.month_val);
INSERT INTO STORES_COMM_MOB_SUB_INFO T1 (
t1.ntlogin,
t1.first_name,
t1.last_name,
t1.job_title,
t1.store_id,
t1.batch_create_dt)
SELECT t2.ntlogin,
t2.first_name,
t2.last_name,
t2.job_title,
t2.store_id,
t2.batch_create_dt
FROM stores_comm_mob_sub_temp t2
WHERE TO_CHAR (batch_create_dt, 'YYYY') = m1.orig_year_val
AND 'M' || TO_CHAR (batch_create_dt, 'MM') =
m2.month_val;
ELSIF lv_subpartition_name IS NOT NULL
THEN
                    DBMS_OUTPUT.PUT_LINE('INSIDE ELSIF => '||m2.month_val);
MERGE INTO (SELECT *
FROM stores_comm_mob_sub_info
SUBPARTITION (lv_subpartition_name)) T1 --> Issue Here
USING (SELECT *
FROM stores_comm_mob_sub_temp
WHERE TO_CHAR (batch_create_dt, 'YYYY') =
m1.orig_year_val
AND 'M' || TO_CHAR (batch_create_dt, 'MM') =
m2.month_val) T2
ON (T1.store_id = T2.store_id
AND T1.ntlogin = T2.ntlogin)
WHEN MATCHED
THEN
UPDATE SET
t1.postpaid_totalqty =
(NVL (t1.postpaid_totalqty, 0)
+ NVL (t2.postpaid_totalqty, 0)),
t1.sales_transaction_dt =
GREATEST (
NVL (t1.sales_transaction_dt,
t2.sales_transaction_dt),
NVL (t2.sales_transaction_dt,
t1.sales_transaction_dt)),
t1.batch_create_dt =
GREATEST (
NVL (t1.batch_create_dt, t2.batch_create_dt),
NVL (t2.batch_create_dt, t1.batch_create_dt))
WHEN NOT MATCHED
THEN
INSERT (t1.ntlogin,
t1.first_name,
t1.last_name,
t1.job_title,
t1.store_id,
t1.batch_create_dt)
VALUES (t2.ntlogin,
t2.first_name,
t2.last_name,
t2.job_title,
t2.store_id,
t2.batch_create_dt);
END IF;
END LOOP;
END LOOP;
COMMIT;
end;
Much appreciate your inputs here.
Thanks,
MK.
(SORRY TO POST THE SAME QUESTION TWICE).
Edited by: Maddy on May 23, 2013 10:20 PM

Duplicate question

Help needed in the Merge Statement

Hi All,
I am using MERGE statement in my program. I want to maintain the log for the duplicate reords mean maintain the log for those reocrds which are updated in the merge statement.
Can any one help me in this that how can i maintain the log?
Thanks for your help in advance.
kind Regards,

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

Problem in Merge statement

Hi All,
I am using merge statement to update 30000 records from the tables having 55 lacs records.
But it is taking much time as i have to kill the session after 12 hours,as it was still going on.
If,Same update i m doing using cursors,it will finish in less than 3 hours.
Merge i was using is :-
MERGE INTO Table1 a
USING (SELECT MAX (TO_DATE ( TO_CHAR (contact_date, 'dd/mm/yyyy')
|| contact_time,
'dd/mm/yyyy HH24:Mi:SS'
) m_condate,
appl_id
FROM Table2 b,
(SELECT DISTINCT acc_no acc_no
FROM Table3, Table1
WHERE acc_no=appl_id AND delinquent_flag= 'Y'
AND financier_id='NEWACLOS') d
WHERE d.acc_no = b.appl_id
AND ( contacted_by IS NOT NULL
OR followup_branch_code IS NOT NULL
GROUP BY appl_id) c
ON (a.appl_id = c.appl_id AND a.delinquent_flag = 'Y')
WHEN MATCHED THEN
UPDATE
SET last_contact_date = c.m_condate;
In this query table 1 has 30000 records and table2 and table 3 have 3670955 and 555674 records respectively.
Please suggest,what i am doing wrong in merge,because as per my understanding merge statement is much better than updates or updates using cursors.
Required info is as follows:
SQL> show parameter user_dump_dest
NAME TYPE VALUE
user_dump_dest string /opt/oracle/admin/FINCLUAT/udu
mp
SQL> show parameter optimizer
NAME TYPE VALUE
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 10.2.0.4
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
optimizer_secure_view_merging boolean TRUE
SQL> show parameter db_file_multi
NAME TYPE VALUE
db_file_multiblock_read_count integer 16
SQL> show parameter db_block_size
NAME TYPE VALUE
db_block_size integer 8192
SQL> column sname format a20
SQL> column pname format a20
SQL> column pval2 format a20
SQL> select
2 sname     ,
3 pname     ,
4 pval1     ,
5 pval2
6 from
7 sys.aux_stats$;
sys.aux_stats$
ERROR at line 7:
ORA-00942: table or view does not exist
Elapsed: 00:00:00.05
SQL> explain plan for
2 -- put your statement here
3 MERGE INTO cs_case_info a
4      USING (SELECT MAX (TO_DATE ( TO_CHAR (contact_date, 'dd/mm/yyyy')
5                          || contact_time,
6                          'dd/mm/yyyy HH24:Mi:SS'
7                          )
8                ) m_condate,
9                appl_id
10           FROM CS_CASE_DETAILS_ACLOS b,
11                (SELECT DISTINCT acc_no acc_no
12                FROM NEWACLOS_RESEARCH_HIST_AYLA, cs_case_info
13                WHERE acc_no=appl_id AND delinquent_flag= 'Y'
14                AND financier_id='NEWACLOS') d
15           WHERE d.acc_no = b.appl_id
16           AND ( contacted_by IS NOT NULL
17                OR followup_branch_code IS NOT NULL
18                )
19           GROUP BY appl_id) c
20      ON (a.appl_id = c.appl_id AND a.delinquent_flag = 'Y')
21      WHEN MATCHED THEN
22      UPDATE
23           SET last_contact_date = c.m_condate
24      ;
Explained.
Elapsed: 00:00:00.08
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
| 0 | MERGE STATEMENT | | 47156 | 874K| | 128K (1)|
| 1 | MERGE | CS_CASE_INFO | | | | |
| 2 | VIEW | | | | | |
| 3 | HASH JOIN | | 47156 | 36M| 5672K| 128K (1)|
| 4 | VIEW | | 47156 | 5111K| | 82339 (1)|
| 5 | SORT GROUP BY | | 47156 | 4236K| 298M| 82339 (1)|
| 6 | HASH JOIN | | 2820K| 247M| 10M| 60621 (1)|
| 7 | HASH JOIN | | 216K| 7830K| | 6985 (1)|
| 8 | VIEW | index$_join$_012 | 11033 | 258K| | 1583 (1)|
| 9 | HASH JOIN | | | | | |
| 10 | INDEX RANGE SCAN | IDX_CCI_DEL | 11033 | 258K| | 768 (1)|
| 11 | INDEX RANGE SCAN | CS_CASE_INFO_UK | 11033 | 258K| | 821 (1)|
| 12 | INDEX FAST FULL SCAN| IDX_NACL_RSH_ACC_NO | 5539K| 68M| | 5382 (1)|
| 13 | TABLE ACCESS FULL | CS_CASE_DETAILS_ACLOS | 3670K| 192M| | 41477 (1)|
| 14 | TABLE ACCESS FULL | CS_CASE_INFO | 304K| 205M| | 35975 (1)|
Note
- 'PLAN_TABLE' is old version
24 rows selected.
Elapsed: 00:00:01.04
SQL> rollback;
Rollback complete.
Elapsed: 00:00:00.03
SQL> set autotrace traceonly arraysize 100
SQL> alter session set events '10046 trace name context forever, level 8';
ERROR:
ORA-01031: insufficient privileges
Elapsed: 00:00:00.04
SQL>      disconnect
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>      spool off
Edited by: user4528984 on May 5, 2009 10:37 PM

For one thing, alias your tables and use that in the column specifications (table1.column1 = table2.column3 for example)...
      SELECT
         DISTINCT
            acc_no acc_no
      FROM Table3, Table1
      WHERE acc_no            = appl_id
      AND   delinquent_flag   = 'Y'
      AND   financier_id      = 'NEWACLOS'We don't know what your tables look like, what columns come from where. Try and help us help you, assume we know NOTHING about YOUR system, because more likely than naught, that's going to be the case.
In addition to that, please read through this which will give you a better-er idea of how to post a tuning related question, you've not provided near enough information for us to intelligently help you.
HOW TO: Post a SQL statement tuning request - template posting

Using Delete in Merge Statement

As merge statement inserts and updates the target data related to the source data but what if the target table contains some additional rows. I mean now both the target table and source tables are not the same. How to do it ?

mshamirtaloo wrote:
As merge statement inserts and updates the target data related to the source data but what if the target table contains some additional rows. I mean now both the target table and source tables are not the same. How to do it ?Well, there's nothing to say that the source and target need to be 'the same' so really not sure what you're asking.
As of Oracle 10 the MERGE command allows for insert, update and delete operations.
http://download.oracle.com/docs/cd/E11882_01/server.112/e10592/statements_9016.htm#SQLRF01606

Merge Statement in Oracle

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