using the MERGE command

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• Copy and update data from one table to the new table by using the Merge command

  Hello
  
  Can someone tell me please how to do this?
  I have a table: EMP (ename, sal, empno (pk), dept) another table is EMP_CLASS ((pk) empno, ename)
  
  I want to insert corresponding lines of emp to table emp_class if this line does'nt exists in emp_class
  otherwise it will be update info by corrsponding emp_class table as well as remove of emp_class according to the emp delete operation.
  
  
  
  
  
  
  Thank you
  Madam.
  
  Published by: Nico on August 12, 2010 22:59

  Have changed. PLS, run once more...

  MERGE INTO emp_class
  With the HELP of emp
  WE (emp.empno = emp_class.empno)
  WHEN MATCHED THEN
  UPDATE
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  emp_class. DEPTNO = emp.deptno,
  emp_class. Class = decode(emp.deptno,10,1,20,2,30,3,40,4)
  DELETE
  WHERE emp_class.empno = emp.empno
  WHEN NOT MATCHED THEN
  INSERT (emp_class.empno, emp_class.name, emp_class.deptno, emp_class.class)
  VALUES (emp.empno, emp.ename, emp.deptno, decode(deptno,10,1,20,2,30,3,40,4));

  P.S. Not tested

  Thank you
  Florian...

  Published by: Florian on August 13, 2010 01:53

• I get a message: to use the 'java' command line tool, you must install a JDK.  I tried 10 times to install without success.  Help, please.

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• When using the merge and when to use updated

  Hi friends,

  Given the best performance... purpose of this discussion is when we should use statement UPDATE and when we should use MERGE statement in oracle update of thousands of records.

  Kindly Guide.

  Kind regards

  Himanshu

  Hello

  Looking for a couple to a few rules that you can use to decide whether to use the MERGE or UPDATE, without actually testing two meanings?

  If so, use MERGE when

  (1) (sometimes) need to add new lines

  (2) it is simpler.  This includes special cases

  (2A) an UPDATE statement uses a subquery in the SET clause and then (mostly) repeats the same subquery in the WHERE clause

  (2B) you want to use the analytical functions or CONNECT BY in a subquery

  These rules are NOT guaranteed to work in all situations.

  Kimmy says:

  Hello

  ... My requirement is only UPDATED records about 200 to 500K (NOT followed by update of insertion).

  So the rule (1) above does not apply in this case.

  What I observed in the update using a MERGE statement and UPDATE is:

  Update with the MERGER was faster however explain the bytes consumed to the query plan MERGE has been compared more update.

  Use the tool that works best for your needs.  If users are complaining that something shows more bytes used in a plan to explain, so maybe it's a reason for the UPDATE.

  Where I work, where is the fastest is usually more important.

  In addition, I want to get clearity

  1. "if I should use MERGE if I need to update recrods using the unique table" as shown below: OR update will be good to use in this case:

  MERGE INTO MKT_DATA inmkt

  C using (SELECT Customer_Code, region, State OF CUSTOMER_DATA)

  ON (inmkt. Distributor_Code = c.Customer_Code AND inmkt. DISTRIBUTOR_CODE IS NOT NULL)

  WHEN MATCHED THEN

  Updated the inmkt VALUE. Distributor_Region = c.Region,

  inmkt. C.State = Distributor_Province;

  UPDATE MKT_DATA inmkt

  SET (inmkt. Distributor_Region, inmkt. Distributor_Province) =

  (SELECT c.Region, c.State OF CUSTOMER_DATA c

  WHERE c.Customer_Code = inmkt. Distributor_Code)

  WHERE inmkt. DISTRIBUTOR_CODE IS NOT NULL;

  2 statements above are not equivalent.

  The UPDATE statement changes all the lines in the table mkt_data that have a distributor_code, this distributor_code be in the table customer_data or not.

  You want something that is equivalent to the MERGE statement, you can use:

  UPDATE MKT_DATA inmkt

  SET (inmkt. Distributor_Region, inmkt. Distributor_Province) =

  (SELECT c.Region, c.State

  OF CUSTOMER_DATA c

  WHERE c.Customer_Code = inmkt. Distributor_Code

  )

  WHERE THERE ARE

  (SELECT 1

  CUSTOMER_DATA C2

  WHERE the c2. Customer_Code = inmkt. Distributor_Code

  )

  ;

  It basically uses the same auxiliary request 2 times (article 2 (a), so I would use MERGE if these are the results I wanted.

  If you have a foreign key constraint, which ensures that each distributor_code in mkt_data will match a line in customer_data, then the 2 statements above will produce the same results.  In this case, I find the UPDATE statement simpler and probably use it rather than MERGE.

  2. to Updating huge amount of records MERGER must be used instead of update?

  I don't know of all short reign as the "use X whenever you have more than 100,000 lines".

  3. If in the update, I need to use several tables then I have to use MERGE?

  MERGE IN MKT_DATA2 t

  WITH THE HELP OF)

  SELECT DISTINCT srt. Sales_Id, tmkt. Cust_Code, srt. PRODUCT_CENTER

  OF srt, CUSTOMER_DATA c, MKT_DATA2 tmkt SALESTERR_PL

  WHERE tmkt.state_Id = 10423

  AND tmkt. Business = 'MARKETING'

  AND c.CUST_CODE = tmkt. Cust_Code

  AND c.Rollup_Code = srt. CUST_CODE

  AND srt. PRODUCT_CENTER = tmkt.PL

  ) d

  WE (t.state_Id = 10423

  AND t.BA = 'MARKETING'

  AND t.Cust_Code = d.Cust_Code

  AND t.PL = d.PRODUCT_CENTER

  AND t.Cust_Code IS NOT NULL

  )

  WHEN MATCHED THEN

  UPDATE SET t.Sales_Id = d.Sales_Id;

  UPDATE MKT_DATA2 tmkt

  SET Sales_Id = (SELECT SALES_ID OF SALESTERR_PL srt

  WHERE the srt. CUST_CODE = (SELECT ROLLUP_CODE FROM CUSTOMER_DATA c

  WHERE c.CUSTOMER_CODE = tmkt. Cust_Code)

  AND srt. PRODUCT_CENTER = tmkt.PL)

  WHERE business = 'MARKETING'

  AND state_Id = 10423;

  Once again, those who are not equivalent.  The UPDATE statement can change more lines than the MERGE statement.

  In addition, you can use the MERGE statement:

  MERGE IN MKT_DATA2 t

  WITH THE HELP OF)

  SELECT DISTINCT srt. Sales_Id, tmkt. Cust_Code, srt. PRODUCT_CENTER

  OF srt, CUSTOMER_DATA c, MKT_DATA2 tmkt SALESTERR_PL

  WHERE tmkt.state_Id = 10423

  AND tmkt. Business = 'MARKETING'

  AND c.CUST_CODE = tmkt. Cust_Code

  AND c.Rollup_Code = srt. CUST_CODE

  AND srt. PRODUCT_CENTER = tmkt.PL

  ) d

  WE (t.Cust_Code = d.Cust_Code

  AND t.PL = d.PRODUCT_CENTER

  )

  WHEN MATCHED THEN

  UPDATE SET t.Sales_Id = d.Sales_Id

  WHERE t.state_Id = 10423

  AND t.BA = 'MARKETING'

  - AND t.Cust_Code IS NOT NULL - does not need, said subquery 'c.CUST_CODE = tmkt. Cust_Code ".

  ;

  If you would care to publish the sample data, I was able to test this.

  4. when the UPDATE is preferred over the MERGER?

  In simple cases, including situations where all you need to know are on the line itself, such as:

  UPDATE emp

  SET sal = sal * 1.05

  Job WHERE NOT IN ('MANAGER', 'PRÉSIDENT')

  ;

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