When i execute the following query, i get the message like
Ora-01427 single-row subquery returns more than one row
I am trying to update "City" column in Table A From another table.
How would I do this?
table A: Name, PER_code(it also has duplicated value or null), city, PD_code
table B: Name, PER_code(No duplicated value,Maybe null), city, Postal_code
The update statement:
UPDATE A
SET (A.city) =
(SELECT B.city
FROM B
INNER JOIN A
ON A.per_code=B.per_code
WHERE A.per_code is not null)
Since there are duplicate values but you select only one field, you modify your query from
UPDATE A SET (A.city) = (SELECT B.city FROM B INNER JOIN A ON
A.per_code=B.per_code WHERE A.per_code is not null)
to
UPDATE A SET (A.city) = (SELECT DISTINCT B.city FROM B INNER JOIN A ON
A.per_code=B.per_code WHERE A.per_code is not null)
The distinct operator will allow you to keep a single value if it's duplicated in the table B. If there are multiple distinct values, you will have to look at your data and make a decision about which value should be used in the other table.
You can also try MERGE INTO selecting DISTINCT records.
MERGE INTO A d
USING
( SELECT DISTINCT per_code, city FROM B ) s
ON ( s.per_code = d.per_code )
WHEN MATCHED THEN UPDATE SET d.City = s.City
WHERE d.per_code IS NOT NULL;
I think you intend a correlated subquery:
UPDATE A
SET city = (SELECT B.city
FROM B
WHERE A.per_code = B.per_code
)
WHERE A.per_code is not null;
EDIT:
The above should work given the constraints in the original question. If it does not, it is easily adaptable:
UPDATE A
SET city = (SELECT B.city
FROM B
WHERE A.per_code = B.per_code AND rownum = 1
)
WHERE A.per_code is not null;
Related
I have this query.
SELECT re_current_benefits.prospect_nbr, qo_quote.quote_id, hra_ind, quote_type, effective_date, quote_expiration_ind, mhs_lob_code
FROM re_current_benefits
INNER JOIN qo_quote ON qo_quote.prospect_nbr = re_current_benefits.prospect_nbr
WHERE hra_ind = 'Y' AND quote_type = 'R' AND quote_expiration_ind IS NULL AND mhs_lob_code NOT IN 'DTL1' AND mhs_lob_code NOT IN 'DTL2'
And I need to pull the prospect_nbr from here, I also need to add a filter saying effective_date = renewal_date but if I do that by joining all 3 tables together I get 0 results which should not be the case.
SELECT prospect_nbr, rmr_run_status, renewal_date
FROM re_group
WHERE rmr_run_status = ANY ('S', 'W')
I want to update a column prtnum and revlvl in table invdtl based on value from select statment, here is the code
update invdtl set invdtl.prtnum = usr_prtmst_xref.prtnum,invdtl.revlvl =
usr_prtmst_xref.colnam ([select
invdtl.prtnum,usr_prtmst_xref.prtnum AS
crossref,invdtl.revlvl,aremst.arecod,aremst.fwiflg from invdtl
join usr_prtmst_xref
on usr_prtmst_xref.prtnum = usr_prtmst_xref.prtnum
join invsub
join invlod
join locmst
join aremst
on aremst.arecod = locmst.arecod
and aremst.wh_id = locmst.wh_id
on locmst.stoloc = invlod.stoloc
and locmst.wh_id = invlod.wh_id
on invlod.lodnum = invsub.lodnum
on invsub.subnum = invdtl.subnum where aremst.arecod = 'EXPR' or
aremst.fwiflg = '1' and rownum <2])
I want to copy two values prtnum and revlvl that are returned by select statement but there is some syntax issue.
There are a bunch of errors here:
The syntax for a multi-column update is basically
update blah
set ( col1, col2 ) = ( select x, y
from
...
)
The syntax for multiple joins is basically
from table1 t1
join table2 t2
on t1.col = t2.col
join table3 t2 on
t2.col = ...
Get ride of "[" and "]"
The predicate rownum<2 is probably to get around the message you received, something like "single row sub-query returns more than 1
row" Which this predicate "fixes" that problem, you are just getting
the first random row; probably not what you want. You probably need to
correlate the sub-query with the update
I would fix these basic syntax errors and try again.
select col_1,
col_2
from tbl_a A,
tbl_b B,
( select col_1,col_2 from tbl_c where clo_c_1 <> '1' ) C
where A.col_1 = B.col_1
and A.col_2 = B.col_2
and (A.col_2 = B.col_2
or C.col_2 = A.col_2);
My environment is Oracle,when I run this SQL,if the sub SQL C hasn't got a result,then the entire SQL returns NULL.Whereas if C has a result(not null) which fits other condions,there could be a result.Would somebody explain why sub SQL at the from area need to be not NULL?Thanks very much.
You need to bring yourself into the 90s and start using standard joins:
select col_1,
col_2
from tbl_a A
inner join
tbl_b B
on A.col_1 = B.col_1
and A.col_2 = B.col_2
left join
( select col_1,col_2 from tbl_c where clo_c_1 <> '1' ) C
on
C.col_2 = A.col_2
As a guess. I'm not entirely sure what your join conditions should be but that's my first attempt.
This is expected behaviour. When you join two result sets, you only want to get results where the join criteria is satisfied. If the criteria are not satisfied, you should get no results.
If I run the query "get me all the employees older than 65, and get their departments", if there are no employees older than 65, you would not expect to get any results, even if there are some departments in the database.
SELECT emp.name, dept.dept_name
FROM emp
JOIN dept
ON (emp.dept_no = dept.dept_no)
WHERE emp.age > 65;
As the others said, if you actually want to get rows regardless of whether the subquery has any results, you need to use an outer join.
I need to update a column called assignment_type_desc in a table randm_sampler with values from source table clm_snapshot based on matching claim_id. The problem is that there are two records in clm_snapshot with NULL claim_id's and different values for assignment_type_desc. I do not need these records, hence I included NOT NULL condition in the update statement. But the update statement still returns single row subquery returns more than one row error.
UPDATE RANDM_SAMPLER SET ASSIGNMENT_TYPE_DESC =
(SELECT DISTINCT A.ASSIGNMENT_TYPE_DESC
FROM CLM_SNAPSHOT A,
RANDM_SAMPLER B
WHERE A.CLAIM_ID = B.CLAIM_ID
AND A.CURRENT_SNAPSHOT_IND='Y'
AND A.HO_CONSULTANT_SEQ_NBR = (SELECT MAX(HO_CONSULTANT_SEQ_NBR)
FROM CLM_SNAPSHOT C
WHERE A.CLAIM_ID = C.CLAIM_ID
AND C.CLAIM_ID IS NOT NULL
GROUP BY CLAIM_ID)
AND A.CLAIM_ID IS NOT NULL )
I am absolutely positive that the duplicates are from the records which have NULL values for the claim_id. But the NOT NULL condition doesn't seem to be effective here. Can someone help me out with this?
Try to following UPDATE statement:
UPDATE RANDM_SAMPLER SET ASSIGNMENT_TYPE_DESC =
(SELECT DISTINCT A.ASSIGNMENT_TYPE_DESC
FROM CLM_SNAPSHOT A
WHERE A.CLAIM_ID = RANDM_SAMPLER.CLAIM_ID
AND A.CURRENT_SNAPSHOT_IND='Y'
AND A.HO_CONSULTANT_SEQ_NBR = (SELECT MAX(HO_CONSULTANT_SEQ_NBR)
FROM CLM_SNAPSHOT C
WHERE A.CLAIM_ID = C.CLAIM_ID
AND C.CLAIM_ID IS NOT NULL
GROUP BY CLAIM_ID)
AND A.CLAIM_ID IS NOT NULL )
I've removed the JOIN to RANDM_SAMPLER from the subquery and instead added the condition that really important because it makes the link to the table to be updated:
A.CLAIM_ID = RANDM_SAMPLER.CLAIM_ID
You probably tried the same but adding the table B made things worse. And there was no connection to the outer table.
MERGE INTO table_1 a
USING
(SELECT * from table_2) b ON ( a.row_id = b.row_id and a.in_correct IS NULL)
WHEN MATCHED THEN UPDATE SET a.in_correct = 'Y';
In the above query ORA-38104:Column referenced in ON clause cannot be updated.
I have been sitting for hours to resolve this.
I have identified that the problem is the field in_correct.
This field "in_correct" cannot be put in both ON clause and also after SET. But in order satisfy my criteria,I have no option.
Please help me out
MERGE INTO table_1 a USING
(SELECT * from table_2) b
ON ( a.row_id = b.row_id)
WHEN MATCHED THEN UPDATE
SET a.in_correct = NVL(in_correct, 'Y');
UPDATE:
A more "general" command (for non null values):
MERGE INTO table_1 a USING
(SELECT * from table_2) b
ON ( a.row_id = b.row_id)
WHEN MATCHED THEN UPDATE
SET a.in_correct = case
when in_correct = 'valuetobereplaced' then 'Y';
else in_correct;
end;