I have no idea how to make this work, hope you can help me
I have a table "student_to_course_term" containing the columns "course_term_id", "student_id", "student_mc_worksheet_id" and "id"
What I want to achieve is to copy all rows with course_term_id=19 to new rows with course_term_id=23. If row already exists, update the "student_mc_worksheet_id".
This is my code so far, but I'm not sure how to access the row with course_term_id=19 and course_term_id=23 after the "on conflict do update set" part. Any help appreciated!
INSERT INTO public.student_to_course_term
(course_term_id, student_id, student_mc_worksheet_id)
SELECT 23, student_id, student_mc_worksheet_id
FROM public.student_to_course_term
WHERE course_term_id = 19
ON CONFLICT ON CONSTRAINT student_to_course_term_student_id_course_term_id_key
DO UPDATE
SET student_mc_worksheet_id ( =>from the student_mc_worksheet_id=23 row) = student_mc_worksheet_id ( => from the student_mc_worksheet_id=19 row) ;
Related
I have a table with duplicate records but without primary key. Data looks like this:
I want to update one empty column with one of column concatenate with row_number. After update, I want to achieve this:
Since the table does not have a unique column, which means I would join back to a CTE or subquery. I know in sql server, it can be done like this:
UPDATE X
SET X.NEW_KEY = X.PERSONNUMBER + '-' + X.NEW_CODE_DEST
FROM (
SELECT ROW_NUMBER() OVER (PARTITION BY PERSONNUMBER) AS NEW_CODE_DEST,PERSONNUMBER,NEW_KEY
FROM EMPLOYEE
) as X;
I tried same logic in postgresql but it didn't work. It threw an error:
SQL Error [42P01]: ERROR: relation "x" does not exist
I also tried this in
UPDATE EMPLOYEE
SET NEW_KEY = X.PERSONNUMBER || '-' || X.NEW_CODE_DEST
FROM (
SELECT ROW_NUMBER() OVER (PARTITION BY PERSONNUMBER) AS NEW_CODE_DEST,PERSONNUMBER
FROM EMPLOYEE
) as X;
The NEW_KEY is updated with duplicate value, not surprise there.
So is there a equivalent method in to achieve the same update result? Or I have my query wrong?
Really appreciate the help!
hey guys I've some data in event_name with a community_code = 1 .
now I need to add rows to the same data to the table with community_code = 2. instead of adding each row, is it possible to add all the rows with different community_code. please help me out thank you.
You can insert by querying the table and replacing values as needed. For example:
insert into community_comms (id, community_id, event_name)
select id, 2, event_name
from community_comms
where community_id = 1
I have been trying to find the correct syntax for the following case (if it is possible?):
MERGE INTO TAB_A tgt
USING TAB_B src ON (src.F1 = tgt.F1 AND src.F2 = tgt.F2
WHEN MATCHED THEN DELETE
ELSE INSERT (tgt.*) VALUES (src.*)
Background: the temp table contains a fix for the target table, as in it contains two types of rows:
the incorrect rows that are to be removed (they match with rows in the target table), and the 'corrected' row that should be inserted (it replaces all the 'delete' rows).
So essentially: remove anything that matches;
insert anything that does not match.
the current error I am getting is:
"Syntax error: expected something between the 'DELETE' keyword and the 'ELSE' keyword"
Any help appreciated, thanks!
You can make use of MultiStatement DELETE and INSERT statement to correct data from temp table into target table
DELETE FROM TAB_A WHERE EXISTS (SELECT 1 FROM TAB_B WHERE TAB_A.F1 = TAB_B.F1 AND TAB_A.F2 = TAB_B.F2)
;INSERT INTO TAB_A SELECT * FROM TAB_B;
I have the following code in Postgres
select op.url from identity.legal_entity le
join identity.profile op on le.legal_entity_id =op.legal_entity_id
where op.global_id = '8wyvr9wkd7kpg1n0q4klhkc4g'
which returns 1 row.
Then I try to update the url field with the following:
update identity.profile
set url = 'htpp:sam'
where identity.profile.url in (
select op.url from identity.legal_entity le
join identity.profile op on le.legal_entity_id =op.legal_entity_id
where global_id = '8wyvr9wkd7kpg1n0q4klhkc4g'
);
But the above ends up updating more than 1 row, actually all of the rows of the identity table.
I would assume since the first postgres statement returns one row, only one row at most can be updated, but I am getting the wrong effect where all of the rows are being updated. Why ?? Please help a nubie fix the above update statement.
Instead of using profile.url to identify the row you want to update, use the primary key. That is what it is there for.
So if the primary key column is called id, the statement could be modified to:
UPDATE identity.profile
SET ...
WHERE identity.profile.id IN (SELECT op.id FROM ...);
But you can do this much simpler in PostgreSQL with
UPDATE identity.profile op
SET url = 'htpp:sam'
FROM identity.legal_entity le
WHERE le.legal_entity_id = op.legal_entity_id
AND le.global_id = '8wyvr9wkd7kpg1n0q4klhkc4g';
Hi I have a temp table (#temptable1) and I want to add a column from another temp table (#temptable2) into that, my query is as follows:
select
Customer
,CustName
,KeyAccountGroups
,sum(Weeksales) as Weeksales
into #temptable1
group by Customer
,CustName
,KeyAccountGroups
select
SUM(QtyInvoiced) as MonthTot
,Customer
into #temptalbe2
from SalesSum
where InvoiceDate between #dtMonthStart and #dtMonthEnd
group by Customer
INSERT INTO #temptable1
SELECT MonthTot FROM #temptable2
where #temptable1.Customer = #temptable2.Customer
I get the following: Column name or number of supplied values does not match table definition.
In an INSERT statement you cannot reference the table you are inserting into. An insert works under the assumption that a new row is to be created. That means there is no existing row that could be referenced.
The functionality you are looking for is provided by the UPDATE statement:
UPDATE t1
SET MonthTot = t2.MonthTot
FROM #temptable1 t1
JOIN #temptable2 t2
ON t1.Customer = t2.Customer;
Be aware however, that this logic requires the Customer column in t2 to be unique. If you have duplicate values in that table the query will seem to run fine, however you will end up with randomly changing results.
For more details on how to combine two tables in an UPDATE or DELETE check out my A Join A Day - UPDATE & DELETE post.
If I understand it correctly you want to do two things.
1: Alter table #temptable1 and add a new column.
2: Fill that column with the values of #temptable2
ALTER #temptable1 ADD COLUMN MothTot DATETIME
UPDATE #temptable1 SET MothTot = (
SELECT MonthTot
FROM #temptable2
WHERE #temptable2.Customer = #temptable1.Customer)