Syntax for Merge statement to insert into target and update source
Hello All,
I want to use Merge statement to insert records when not matched in my target and update records in source when matched. Is it possible to do using Merge statement.
create table a (aa number)
create table b (bb number)
alter table a add flg char(1)
merge b as target
using a as source
on (target.bb = source.aa)
when matched then
update set source.flg = 'Y'
WHEN NOT MATCHED THEN
insert (target.bb)
values
(source.aa)
Thanks.
Hi,
I have no idea about the version of DB, else some new features with respect version can be specified - just for informaitve purpose and to post across the verison of DB in future posts.
Coming to your issue and requirement.
if you check the syntax and functionality , then its on Merge on target base only - with respect to Update (matched o columns) and insert (for unmatched columns). Source - as the term is clear. It might not work out on source table.
- Pavan Kumar N
- ORACLE OCP - 9i/10g
https://www.oracleinternals.blogspot.com
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I want to select from one table and update in another table. So i dont want insert statement and i want to do it in single query....possible solutions are requested.
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I have a MERGE statement, I am executing it from shell script, I want to print that how many rows has been updated and Inserted.
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Thanks in AdvanceI want to print that how many rows has been updated and Inserted. If you really want/need to print that information, then don't use MERGE but INSERT and UPDATE statements.
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:35615502072484
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Popup not INSERTing into table and not refreshing called page ...
Greetings
Environment: APEX 3.1.1.00.09 on AIX 5.3 in 10gR2
I have read many of the threads concerning my issue and I feel I am getting close to the answer but somehow have combined too many of the suggestions and am tripping over my own code.
Please look at my sample application on apex.oracle.com:
Workspace: galway
User: gwicke
Password: gwicke
Please start with Page3, select any Agency and then click 'Add New Contract'.
There is currently a <strong>BOLD </strong>label 'Add New Builder' that is a link that should open a popup window. Type any name into the field and click 'Create Builder'. This should INSERT the row into the builder table, close the popup, assign the new builder name to the calling page item 'Builder Name' and populate the screen item.
In it's current state, the application will open the popup window, allow entry and close upon clicking the 'Create Builder' button. However the new builder is NOT inserted into the table and the calling page item is not populated.
By looking at the Page Items and Session State I can see the correct values assigned to the 'Pn_BULDER_NAME' items on both the popup page (4) and the calling page (2) but the value does not appear on the screen.
I've read where there's really two parallel universes, no sorry, two versions of the screen items, one in Session State and one that is displayed in the browser and there are steps to take to be sure the one displayed is updated from Session State as I would like in this case.
I've entered Javascript code in the Page4 - header to define the 'passBack2()' function and code in the 'Optional URL Redirect' section of the 'Add Builder' button to hopefully execute the ARP for the INSERT, assign the Page2 items and close the popup. It doesn't quite get all that done.
Any helpp is greatly appreciated. Thanks to Denes for most of the code suggestions I've followed.
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I think that there's a very simple solution to this - didn't really spot it last night.
Firstly, yes, you could use a "button" to handle the call for the popup - just make sure that the button is a URL type "button" that is actually an A tag with the call in the URL target setting. Alternatively, you could take you existing A tag and use the same class attribute for one of your buttons as this should make it look like a button.
More importantly, though, I think that we could do it as:
1 - On your page 2 popup call, clear that cache for page 4 (the popup page) - I have already done this in your app by updating the url
2 - On the popup page, allow the user to enter in their desired P4_BUILDER_NAME value (not sure if you want to do something to make this unique?)
3 - Let the user click the Create button on the popup. This will submit the page, which will get your P4_BUILDER_RANK (the pk) value and insert a new record into the table (you could consider creating a sequence and a trigger to handle the creation of a new PK value?).
4 - Assuming the P4_BUILDER_RANK then exists (it wouldn't if there was an error somewhere), then conditionally display a region that had a piece of javascript that submits page 2 and then closes itself - we don't need to pass anything back to page 2 (see below)
5 - As the P4_BUILDER_NAME and P4_BUILDER_RANK exist in the session, when page 2 is being reloaded, (A) the select list would be updated with the new Builder (still not sure why all my entries appeared at the bottom instead of in alpha order??) and (B) both P2_BUILDER_NAME and P2_BUILDER_RANK can have Post Calculation Computations set (NVL(:P4_BUILDER_NAME,:P2_BUILDER_NAME) and NVL(:P4_BUILDER_RANK, :P2_BUILDER_RANK) respectively) - the effect of this is, if there are values stored in the P4 page items, we use them, otherwise we use whatever values were in the P2 page items
6 - Finally, to stop (5) happening in all page 2 loads, you would need to clear the cache for page 4 in as many places as possible - eg, branches to page 2 or buttons on page 2
The reason we can't pass values back to page 2 is that one of the items is a select list. The value we want to select won't appear on the select list until the page has been submitted. So, we can't set the value and submit because the value isn't there. We can't submit and set the value because javascript wouldn't know when the page has been updated (or, at least, you would have to put some independant mechanism in place to identify this, which may become complicated).
So, simply put, as long as we know that if the values are in the session, we can use Post Calculation Computations to set our fields to these values. The only thing to bear in mind is that we need to ensure that these session values only exist when we need them - hence clearing the cache. This principle should work for any type of field - but, as you have no doubt seen, simple text fields can be updated by the popup directly as the field should accept any value we give it.
My only other recommendation would be to completely remove the MRU processes from the page as these are not required (they just confuse the issue) and you could make your PK fetch and record insert into a single process - just to keep things neat and tidy, you understand!
When I finished with your app last night, I did leave it so that javascript would create a new option on the select list and then set the value. But the above methodology seems to be a lot simpler.
Andy
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