I am getting SQL Error: ORA-01779: cannot modify a column which maps to a non key-preserved table error on this statement:
UPDATE
(
SELECT CELLS.NUM, UND.CLIENT_PARAMS
FROM CELLS
LEFT OUTER JOIN UND
ON CELLS.UND_ID = UND.ID
WHERE CELLS.SASE = 1
) t
SET t.CLIENT_PARAMS = 'test';
I would like to update CLIENT_PARAMS field for all rows, which select returns.
The most straightforward (though possibly not the most efficient) way to update rows in one table which correspond directly to rows in another table via an identity column would be to use WHERE table1.column IN (SELECT id FROM table2 WHERE ...).
In this case:
UPDATE UND
SET client_params = 'test'
WHERE id IN
(SELECT und_id
FROM CELLS
WHERE SASE=1)
Try this
UPDATE und u
SET client_params = 'test'
WHERE EXISTS
(SELECT 1
FROM cells c
WHERE C.SASE = 1
AND c.und_id = u.id)
Related
I am new to Oracle. I am trying to update the values of a table with the values from a SELECT DISTINCT statement using the MERGE INTO method. I want to update the values for a table based on what is in the USING table conditionally.
A quick diagram of what I am essentially going for is
MERGE
INTO update_table ut
USING
(SELECT DISTINCT
t1.column_1
,t2.column_2
FROM table_1 t1
INNER JOIN table_2 t2
ON t1.foreign_key = t2.primary_key) st
ON (ut.pk = st.column_1)
WHEN MATCH UPATE
SET(ut.update_column = st.column_2
WHERE st.column_1 = 1
AND st.column_2 = 1
,ut.update_column = st.column_2
WHERE st.column_1 = 2
AND st.column_2 = 2);
However, when I do so I get the INVALID COLUMN SPECIFICATION error on the line where I use SET. How can I work around this to successfully update the table, preferably in ANSI standard?
You can include the conditions that you have added in where clause in the selected column list in using clause itself. Like This. (Not tested. Your conditions in where clause were not appropriate)
MERGE
INTO update_table ut
USING (SELECT DISTINCT
t1.column_1 ,
CASE
WHEN t1.column_1 = 1
AND t2.column_2 = 1
THEN t2.column_1
WHEN t1.column_1 = 2
AND t2.column_2 = 2
THEN t2.column_2
END column_2
FROM
table_1 t1
INNER JOIN table_2 t2 ON t1.foreign_key = t2.primary_key
) st
ON (ut.pk = st.column_1)
WHEN MATCHED THEN
UPDATE SET ut.update_column = st.column_2 ;
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!
Why does my update statement say - "cannot insert null into gitb_auto_debit_upload.status". The second query returned a record where the column process_status was having 'P' as its value.
Update gitb_auto_debit_upload a
set status = (select nvl(process_status,'O') from gitb_daily_log b
where b.interface_code = 'PHP661OW'
and b. process_ref_no = '4708'
and a.refno = b.external_ref_no
and a.recordno = b. seq_no
) ;
select * from gitb_auto_debit_upload a, gitb_daily_log b where b.interface_code = 'PHP661OW'
and b. process_ref_no = '4708'
and a.refno = b.external_ref_no
and a. recordno = b. seq_no
The error message comes from a record in gitb_auto_debit_upload for which the select (the one inside the update) statement returns no row.
Your update statement processes all records of gitb_auto_debit_upload.
Your select (the one you use to test the status value) statement only those records for which a record in gitb_daily_log exists.
You need to change the update statement to either only update those rows for whicht the select return a row or to place the NVL() around the select.
How do I merge data from multiple rows in one table to a single column in a new table?
create table new_paragraphs
(
id NUMBER
paragraph CLOB
);
create table old_paragraphs
(
id
paragraph CLOB
);
merge into new_paragraphs a
using (select * from old_paragraphs) b
on (id = id)
when matched then
update set a.paragraph = a.paragraph || b.paragraph;
-- Results in error: unable to get a stable set of rows in the source tables
The above throws an exception.
It would work if id were a primary key in at least *old_paragraphs* (or if it were unique for each id found in *new_paragraph*)
Other than that, you want to use aliases in on (id = id) so that it reads on (a.id = b.id):
merge into new_paragraphs a
using (select * from old_paragraphs) b
on (a.id = b.id)
when matched then
update set a.paragraph = a.paragraph || b.paragraph;
Why are you doing a MERGE here? Why not a simple UPDATE (assuming ID is the primary key of both tables)
UPDATE new_paragraphs a
SET paragraph = (select a.paragraph || b.paragraph
from old_paragraphs b
where a.id = b.id)
WHERE EXISTS (SELECT 1
FROM old_paragraphs b
WHERE a.id = b.id)