need help with the Merge statement
I'm on: Oracle Database 11 g Enterprise Edition Release 11.2.0.2.0 - 64 bit ProductionI'm currently an UPDATE statement and then it works and is accurate, it takes 30 minutes. I heard that MERGE
can do the same thing and is just as accurate and much faster!
Here's the query I want to convert into a MERGE INTO statement. I tried to do it myself, but I get errors and don't know simply, since it's new for me.
Basically I want to update table your on a corresponding condition in the table tt for 2 columns (GTP and UPDATE_DT), for UPDATE_DT I want to insert the Date current system.
UPDATE /*+ PARALLEL (16) */ OLDER_Table ta
SET (ta.GTP, ta.UPDATE_DT) =
(SELECT /*+ PARALLEL (16) */ tt.GTP, SYSDATE
FROM NEWER_Table tt
WHERE ta.cust_id = tt.cust_id
AND ta.STAMP_DATE = tt.STAMP_DATE
AND ROWNUM = 1)
WHERE EXISTS (SELECT 1
FROM NEWER_Table tt
WHERE ta.cust_id = tt.cust_id
AND ta.STAMP_DATE = tt.STAMP_DATE
AND (NVL(ta.GTP, 'X') != NVL(tt.GTP, 'X')));
Thank you!
Hello
Whenever you have a problem, please post a small example of data (CREATE TABLE and only relevant columns, INSERT statements) of all of the tables involved.
Also post the results you want from this data, as well as an explanation of how you get these results from these data, with specific examples.
If you ask on a DML statement, such as UPDATE, CREATE TABLE and INSERT statements need to re - create the tables as they are before the DML, and results will be the content of the or the tables changed when it's all over.
See the FAQ forum {message identifier: = 9360002}
MERGE peut be much faster than update; Sometimes, there is no significant difference in speed.
Tables in multiple situations like this, I've never seen a case where the MERGER has been slower than the UPDATE, even if the UPDATE is sometimes easier to code and just as fast.
Maybe that's what you want:
MERGE INTO older_table dst
USING (
SELECT n.cust_id
, n.stamp_date
, n.gtp
, ROW_NUMBER () OVER ( PARTITION BY n.cust_id
, n.stamp_date
ORDER BY n.gtp
) AS r_num
FROM newer_table n
JOIN older_table o ON n.cust_id = o.cust_id
AND n.stamp_date = o.stamp_date
AND NVL ( n.gtp
, 'X'
) != NVL ( o.gtp
, 'X'
)
) src
ON ( src.cust_id = dst.cust_id
AND src.stamp_date = dst.stamp_date
AND src.r_num = 1
)
WHEN MATCHED THEN UPDATE
SET dst.gtp = src.gtp
, dst.update_date = SYSDATE
;
As I can't test it, I can't be sure.
Tags: Database
Similar Questions
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need help with the Update statement
Hello
I received a question in a course and I tried my best to respond, and now my brain is giving. I would really appreciate help with the update statement. I don't mind if you do not validate a solution, a little nudge in the right direction would be really useful. I'll post that I got.
THE QUESTION
/ * For these agents disabled on more than seven missions, change their date of deactivation of the first date of deactivation of all the agents that have been activated in the same year as the agent that you update currently.
*/
I have it divided into parts, here is my select statement to agents disabled on more than 7 missions, which produces the deactivation_dates in the agents table that I want to update...
.. .and the code for the first date of deactivation for each year of activation agentSELECT s.deactivation_date FROM ( SELECT a.deactivation_date, count(m.mission_id) as nomissions FROM agents a INNER JOIN missions_agents m on a.agent_id=m.agent_id GROUP BY a.deactivation_date ) s WHERE s.nomissions>7 AND s.deactivation_date IS NOT NULL
..... I am not real to marry these two statements together in the Update statement. I can't extract each date of deactivation produced in the first select statement and their match against the first date of deactivation in the year they have been activated for the second select statement.select a2.deactivation_date from agents a2 where a2.deactivation_date= ( select min(a.deactivation_date) from agents a where to_number(to_char(a.activation_date,'YYYY'))=to_number(to_char(a2.activation_date,'YYYY')) )
Any help greatly appreciated... :))I began to wonder how things would :)
user8695469 wrote:
First of all why he chooses the date the earliest of all agentsUPDATE AGENTS_COPY AC /* (1) */ SET DEACTIVATION_DATE = ( SELECT MIN(AGS.DEACTIVATION_DATE) FROM AGENTS_COPY AGS , AGENTS_COPY AC /* (2) */ WHERE TRUNC(AGS.ACTIVATION_DATE,'YEAR') = TRUNC(AC.ACTIVATION_DATE,'YEAR') /* (3) */ )
He recovers as soon as the subquery has not been correctly set in the SET clause. It seems you are trying to update a correlated, but we are still having a conceptual shift. I have added a few comments to your code above and below will explain.
(1): when you do a correlated update it is useful to the table alias that you did right here.
(2): this table statement is not necessary and is the reason why the FIRST deactivation date is selected. The alias that you use (3) refers to THIS table, not the one defined in the update statement. Remove the line indicated by (2) in the FROM clause and a correlated update will happen.
and secondly why is it to update each row, when I thought that I'm just the lines where the agents are disabled and missions > 7? Pointers on where I'm wrong would be very appreciated. (SQL = stupid query language!) :)
user8695469 wrote: then why is it to update each row, when I thought that I'm just the lines where the agents are disabled and missions > 7? Pointers on where I'm wrong would be very appreciated. (SQL = stupid query language!) :)
WHERE EXISTS ( SELECT a.agent_id, count(m.mission_id) FROM agents a /* INNER JOIN AC ON AC.AGENT_ID = A.AGENT_ID */ INNER JOIN missions_agents m ON a.agent_id=m.agent_id GROUP BY a.agent_id, a.deactivation_date HAVING count(m.mission_id)>7 AND a.deactivation_date IS NOT NULL )
Once again this problem is similar to the question above that a correlation update doesn't work. Test existence of lines in an EXISTS subquery. Since your subquery is not related to the table that you are trying to update, it will be always return a line and, therefore, it returns true for EACH LINE in the AGENTS table. To limit the game to only agents > 7 missions results, you need to add a join condition that references the table in your update statement. I added one above (with comments) as a sample.
I recommend you look over all material that you have associated with correlated subqueries, including documents that I posted above. This seems to be what you're having the problem more with. If you need me to explain the concept of correlated queries any better please let me know.
Thank you!
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Need help with the merger of the lines of a virtual Table based on a foreign key
The following is the result of the sample of a large SQL SELECT statement exits from a single table. I used - to show the values of X in each column
CODE - XX - YY - ZZ_
AD------------X-----------------------------------
AD-----------------------------------------------X
AD---------------------------X--------------------
CD------------X-----------------------------------
CD-----------------------------------------------X
CD---------------------------X--------------------
I would like to further clarify the results above by the merger on a single line for each CODE. Example below.
Please note that each line for each code, has only a single value. Thus, by using a CONCAT function would be fine for me. I am at a loss to identify the parent SQL statement to merge data as below
CODE - XX - YY - ZZ_
AD - X - X - X
CD - X - X - X
Seek help from people on this forum
Published by: cseshan on October 18, 2010 21:04
Published by: cseshan on October 18, 2010 21:05
Published by: cseshan on October 18, 2010 21:08
Published by: cseshan on October 18, 2010 21:09
Published by: cseshan on October 18, 2010 21:09
Published by: cseshan on October 18, 2010 21:11also - if you put the [code] [/ code]
Tags around your code (without spaces) you can format it slightly betterBy asking questions on the forum it is also good to add table creation/insert script or use a statement and other you should reproduce your data
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If the above consists of:
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