I am having a hard time getting my delete to work. I need to delete based on two columns in this case where the row exists in a source table.
I have 113843 rows in the table. My delete statement is:
delete from process.designer_mm_px_current_state
where exists (select 1 from process.designer_mm_px_current_state dc
join
process.mm_px_current_state c
on dc.soid = c.soid and dc.state_id = c.state_id)
This reports 113843 rows deleted. But I have inserted a new row that is only in dc, so I should have one row at the end. Also:
select count(1) from process.designer_mm_px_current_state dc
join
process.mm_px_current_state c
on dc.soid = c.soid and dc.state_id = c.state_id
returns 113842 rows. Just as I expected. What am I missing? I am working in an oracle system...
You have no reference between your inner and outer query. Try this instead. Dc is now your outer reference.
delete from process.designer_mm_px_current_state dc
where exists (select 1 from
process.mm_px_current_state c
Where dc.soid = c.soid and dc.state_id = c.state_id)
Related
I need to update one column in table A with the result of a multiplication of one field from table A with one field from table B.
It would be pretty simple to do this in T-SQL, but I can't write the correct syntax in Oracle.
What I've tried:
UPDATE TABLE_A
SET TABLE_A.COLUMN_TO_UPDATE =
(select TABLE_A.COLUMN_WITH_SOME_VALUE * TABLE_B.COLUMN_WITH_PERCENTAGE
from TABLE_A
INNER JOIN TABLE_B
ON TABLE_A.PRODUCT_ID = TABLE_B.PRODUCT_ID
AND TABLE_A.SALES_CHANNEL_ID = TABLE_B.SALES_CHANNEL_ID)
WHERE TABLE_A.MONTH_ID IN (201601, 201602, 201603);
But I keep getting errors. Could anybody help me, please?
I generally prefer to use the below format for such cases since this will ensure there's no update performed if there's no data in the table(query extracted temp table) whereas in the above solution provided by Brian Leach will update the new value as null if there's no record present in the 2nd table but exists in the first table.
UPDATE
(
select TABLE_A.COLUMN_TO_UPDATE
, TABLE_A.PRODUCT_ID
, TABLE_A.COLUMN_WITH_SOME_VALUE * TABLE_B.COLUMN_WITH_PERCENTAGE as value
from TABLE_A
INNER JOIN TABLE_B
ON TABLE_A.PRODUCT_ID = TABLE_B.PRODUCT_ID
AND TABLE_A.SALES_CHANNEL_ID = TABLE_B.SALES_CHANNEL_ID
AND TABLE_A.MONTH_ID IN (201601, 201602, 201603)
) DATA
SET DATA.COLUMN_TO_UPDATE = DATA.value;
This solution can cause key preserved value issues which shouldn't be an issue here since i expect a single row in both the tables for one product(ID).
More on Key Preserved table concept in inner join can be found here
https://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:548422757486
#Jayesh Mulwani raiesed a valid point, this will set the value to null if there is no matching record. This may or may not be the desired result. If it isn't, and no change is desirect, you can change the select statement to:
coalesce((SELECT table_b.column_with_percentage
FROM table_b
WHERE table_a.product_id = table_b.product_id AND table_a.sales_channel_id = table_b.sales_channel_id),1)
If this is the desired outcome, Jayesh's solution will be more efficient as it will only update matching records.
UPDATE table_a
SET table_a.column_to_update = table_a.column_with_some_value
* (SELECT table_b.column_with_percentage
FROM table_b
WHERE table_a.product_id = table_b.product_id
AND table_a.sales_channel_id = table_b.sales_channel_id)
WHERE table_a.month_id IN (201601, 201602, 201603);
I'm practically new in using oracle and I bumped into a blocker. Below is the query that I created based on what I have researched online to update multiple columns of a table with values from a nested join statement.
UPDATE
(
SELECT
A.COLUMN1 OLD_COLUMN1,
BC.COLUMN1 NEW_COLUMN1,
A.BALANCE OLD_COLUMN2,
BC.COLUMN2_MIN NEW_COLUMN2,
A.COLUMN3 OLD_COLUMN3,
BC.COLUMN3 NEW_COLUMN3
FROM TABLE_A A
INNER JOIN
(
SELECT B.TWWID,
B.ITEMDATE,
B.COLUMN2_MIN,
C.COLUMN3,
C.COUNTRYID,
C.COLUMN1
FROM TABLE_B B
LEFT OUTER JOIN TABLE_C C
ON TO_CHAR(B.ID) = TO_CHAR(C.ID)
) BC
ON A.ID = BC.ID
AND A.DATE = BC.DATE
)ABCUPDATE
SET ABCUPDATE.OLD_COLUMN1 = ABCUPDATE.NEW_COLUMN1,
ABCUPDATE.OLD_COLUMN2 = ABCUPDATE.NEW_COLUMN2,
ABCUPDATE.OLD_COLUMN3 = ABCUPDATE.NEW_COLUMN3;
Selecting the sub-query returns the expected results but when I run the update script as a whole an error is returned.
ORA-01779: cannot modify a column which maps to a non key-preserved
table
Can anyone please explain why I encounter this error and what adjustments can I do to the script to make it work?
Thanks in advance!
I have this table F_Flight which I am trying to insert into from 3 different tables. The first, fourth and fifth columns are from the same, and the second and third columns from different tables. When I execute the code, I get a "single-row subquery returns more than one row" error.
insert when 1 = 1 then into F_Flight (planeid, groupid, dateid, flightduration, kmsflown) values
(planeid, (select b.groupid from BridgeTable b where exists (select p.p1id from pilotkeylookup p where b.pilotid = p.p1id)),
(select dd.id from D_Date dd where exists (select p.launchtime from PilotKeyLookup p where dd."Date" = p.launchtime)),
flightduration, kmsflown) select * from PilotKeyLookup p;
Your subqueries get multiple rows back, which is what the error message says. There is no correlation between the various bits of data and subqueries you're trying to insert into a single row.
This can be done as a much simpler insert...select with joins, something like:
insert into f_flight (planeid, groupid, dateid, flightduration, kmsflown)
select pkl.planeid, bt.groupid, dd.id, pkl.flightduration, pkl.kmsflown
from pilotkeylookup pkl
join bridgetable bt on bt.pilotid = pkl.p1id
join d_date dd on dd."Date" = pkl.launchtime;
This joins the main PilotKeyLookup table to the other two on the keys you used in your subqueries.
Storing an ID value instead of an actual date is unusual, and if launchtime has a time component - which seems likely from the name - and your d_date entries are just dates (i.e. all with time at midnight) then you won't find matches; you might need to do:
join d_date dd on dd."Date" = trunc(pkl.launchtime);
It also seems like this could be a view, as you're storing duplicate data - everything in f_flight could, obviously, be found from the other tables.
I have a requirement to read from 2 tables once read i have to update the falg on both table.
My SQL query
SELECT t1.KUNNR,t1.SETT_KEY,t1.QUART_START,t1.QUART_END,t2.PAY_METH,t2.MAT_NDC,t2.AMOUNT
FROM TSAP_REBATE_MEDI t1
INNER JOIN TSAP_REBATE_LINE t2 ON t1.KUNNR=t2.KUNNR AND t1.SETT_KEY=t2.SETT_KEY
WHERE t1.PROCESSING_STATUS = 'N' AND t2.PROCESSING_STATUS = 'N'
This is working fine now i need an update query for the same where PROCESSING_STATUS is set to 'P' on both tables.
You cannot update two tables at the same time. Run two separate UPDATE statements of the following nature
UPDATE t1
SET COLUMN = VALUE
FROM TSAP_REBATE_MEDI t1
INNER JOIN TSAP_REBATE_LINE t2
ON t1.KUNNR=t2.KUNNR
AND t1.SETT_KEY=t2.SETT_KEY
WHERE t1.PROCESSING_STATUS = 'N'
AND t2.PROCESSING_STATUS = 'N'
/* Add any other conditions */
However, if you want them both to be updated (or neither one), wrap both updates in a BEGIN TRANSACTION - COMMIT
I do know update clause doesn't work with joins in Oracle.
update table1 Pr
set code = (select t2.class_attr_value from table2 t2
where class_attr_name = 'sample' and Pr.epcclass_id = t2.epcclass_id)
I would be thankful if someone can help me modify my query so that I don't get the error of SQL Command not ended properly.
Your Query seems okay to me I just added Table Alias. Your query will update all records in table1. What error you are getting...??
Suggestions,
a) Unless it's the intent that you want to update all records, add a where clause in the query to avoid updating all records...
b) If you are getting (ORA-01427: single-row subquery returns more than one row) then means corelated sub query (within brackets) is missing some condition to make it fetch only 1 row per epcclass_id.
update table1 Pr
set Pr.code = (select t2.class_attr_value
from table2 t2
where t2.class_attr_name = 'sample'
and t2.epclass_id = Pr.epcclass_id
);
Try this:
UPDATE table1 Pr INNER JOIN table2 t2
ON t2.class_attr_name = 'sample' AND Pr.epcclass_id = t2.epcclass_id
SET Pr.code = t2.class_attr_value