This is the query I am using to update a column with value from another table :
UPDATE SPICES A
SET A.description = (SELECT CODE
FROM CHILLY B
WHERE SUBSTR(A.description,1,4) = TRIM(B.desc123))
WHERE EXISTS (SELECT 1
FROM CHILLY B
WHERE SUBSTR(A.description,1,4) = TRIM(B.desc123));
But this is not what I want . The requirement is to update the first 4 characters of description with the new value (CODE) from table CHILLY.
Any suggestions? new to writing queries.
You should use a concatenation operator for adding the rest of description
UPDATE SPICES A
SET A.description = (SELECT CODE
FROM CHILLY B
WHERE SUBSTR(A.description,1,4) = TRIM(B.desc123)) || SUSBSTR(A.description, 5, 255 )
WHERE EXISTS (SELECT 1
FROM CHILLY B
WHERE SUBSTR(A.description,1,4) = TRIM(B.desc123));
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 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)
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.
I am new in oracle and I want to update multiple row value where the column id = 1 , 2.
I tried this :
update Tester
set employee_phone_number = ( 0789456123,0789456321)
where employee_id in (1,2);
but it gives me "missing right parenthesis"
any help please and thanks in advance.
Another approach:
merge into
tester
using (
select 1 id,'0123456785' employee_phone_number from dual union all
select 2 id,'0123456786' employee_phone_number from dual) new_values
on (
tester.id = new_values.id)
when matched then update
set employee_phone_number = new_values.employee_phone_number;
More words, but allows the values to be specified in only one place and extends to allow inserts where the id does not already exist.
http://sqlfiddle.com/#!4/8fc86/3
Try this instead:
update Tester
set employee_phone_number = CASE WHEN employee_id = 1 THEN 0789456123
WHEN employee_id = 2 THEN 0789456321
END
where employee_id in (1,2);
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)