CODEWITHSUNDEEP
oracle-databaseoracle11g
DaveSlash
DaveSlash

Reputation: 55

Oracle MERGE statement error (ORA-30926)

I inherited an Oracle script running on Oracle 11g that contains the following MERGE statement:

MERGE INTO MainTable PR
     USING IncrementalTable PRA
       ON (PR.contract = PRA.contract
       and PRA.memberType = 'Parent' )
     WHEN MATCHED THEN
       UPDATE SET PR.address1 = PRA.address1,
                  PR.city = PRA.city,
                  PR.state = PRA.sate,
                  PR.zipCode = PRA.zipCode,
                  PR.countryCode = PRA.countryCode
WHERE address1 IS NULL
  AND PR.memberType <> 'Parent'
;

As far as I can see, this is simply updating the child's address in MainTable from the parent's address in IncrementalTable. Unfortunately, when I run the statement, it throws the following error:

ORA-30926: unable to get a stable set of rows in the source tables

So, it looks like it can't find a distinct match in IncrementalTable with which to update. Querying the data, that appears to be the case:

select contract,
       memberType,
       count(*)
  from IncrementalTable
 group by contract,
       memberType
having count(*) > 1
;

CONTRACT               MEMBERTYPE   COUNT(*)
---------------------- ---------- ----------
1119839490             PARENT              2
7271122516             PARENT              2
1004798721             PARENT              2

Looking at the details of one of those contracts:

select *
  from IncrementalTable
 where contract = '1119839490'
   and memberType = 'Parent'
;


CONTRACT               MEMBERTYPE ADDRESS1          CITY                           STATE ZIPCODE   COUNTRYCODE
---------------------- ---------- ----------------  ------------------------------ ----- -------   -----------
1165439488             Parent     1234 Dorioth St   Orlando                        FL    32825     USA
1165439488             Parent     1234 Dorioth St   Orlando                        FL    32825     USA

So, how can I merge only the DISTINCT match from IncrementalTable?

Thanks in adavnce for your help!

Upvotes: 1

Views: 449

Answers (1)

Allan
Allan

Reputation: 17429

The first (and most obvious) answer is to clean up the data so you don't have duplicates. It seems likely that the sample data you provided is the result of a bug.

As for the merge statement, if the data is actually purely duplicated, you can just use distinct:

MERGE INTO maintable pr
USING      (SELECT DISTINCT contract,
                            membertype,
                            address1,
                            city,
                            state,
                            zipcode,
                            countrycode
            FROM   incrementaltable pra
            WHERE  pra.membertype = 'Parent')
ON         (pr.contract = pra.contract)
WHEN MATCHED THEN
   UPDATE SET pr.address1 = pra.address1,
              pr.city = pra.city,
              pr.state = pra.sate,
              pr.zipcode = pra.zipcode,
              pr.countrycode = pra.countrycode
      WHERE      address1 IS NULL AND pr.membertype <> 'Parent'

Upvotes: 1

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